Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Apr. 30, 2015
Jan. 31, 2015
Fair Value Disclosures [Abstract]    
Maximum maturity of marketable securities Three months or less  
Escrow agreement fund $ 2.5us-gaap_EscrowDeposit  
Escrow reserve   1.1us-gaap_ReplacementReserveEscrow
Acquisition date Feb. 02, 2015  
Cash equivalents and marketable securities $ 85.3seac_AggregateCashCashEquivalentsShortTermInvestmentsAndRestrictedCash $ 105.4seac_AggregateCashCashEquivalentsShortTermInvestmentsAndRestrictedCash