Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Available-for-Sale Securities (Detail)

v2.4.1.9
Fair Value Measurements - Summary of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
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