Fair Value Measurements - Summary of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2015
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Jan. 31, 2015
|
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Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost | $ 85,230us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 104,285us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Gross Unrealized Gains | 31us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 43us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |
Gross Unrealized Losses | 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Estimated Fair Value | 85,261us-gaap_AvailableForSaleSecurities | 104,328us-gaap_AvailableForSaleSecurities |
Cash [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
69,356us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
88,444us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
Estimated Fair Value |
69,356us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
88,444us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
Cash Equivalents [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
3,615us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
1,575us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Estimated Fair Value |
3,615us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
1,575us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Cash and Cash Equivalents [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
72,971us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
90,019us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
Estimated Fair Value |
72,971us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
90,019us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember |
U.S. Treasury Notes and Bonds - Short Term [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
1,499us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
1,500us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
Gross Unrealized Gains |
1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
Estimated Fair Value |
1,500us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
1,501us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesShortTermMember |
U.S. Treasury Notes and Bonds - Long Term [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
6,267us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
4,268us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
Gross Unrealized Gains |
12us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
18us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
Estimated Fair Value |
6,279us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
4,286us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsTreasuryBondSecuritiesLongTermMember |
U.S. Government Agency Issues Short Term [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
2,003us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
6,008us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
Gross Unrealized Gains |
4us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
7us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
Estimated Fair Value |
2,007us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
6,015us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesShortTermMember |
U.S. Government Agency Issues Long Term [Member] | ||
Schedule of Available-for-Sale Securities [Line Items] | ||
Amortized Cost |
2,490us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
2,490us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
Gross Unrealized Gains |
14us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
17us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
Gross Unrealized Losses |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
Estimated Fair Value |
$ 2,504us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
$ 2,507us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = seac_UsGovernmentAgencyIssuesLongTermMember |
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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