Other Balance Sheet Accounts - Schedule of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 88,794	$ 64,988
Accrued compensation	339,982	397,002
Accrued other liabilities	314,311	235,543
Accrued income and other taxes payable	141,388	153,026
Accrued professional costs	17,597	15,864
Customer liability, current	19,737	53,957
Accrued rent	14,133	13,944
Accrued expenses and other current liabilities	$ 935,942	$ 934,324