Other Balance Sheet Accounts - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Deferred income taxes, noncurrent, net	$ 17,597	$ 15,986
Long-term deposits	23,650	19,469
Other	89,652	66,310
Other assets, net	409,185	370,910
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Unamortized debt issuance costs		7,900
Purchased intangible assets, net of accumulated amortization of $228,704 and $212,248, respectively
Finite-Lived Intangible Assets [Line Items]
Purchase and acquired intangible assets	267,722	258,580
Accumulated amortization	228,704	212,248
Acquired intellectual property, net of accumulated amortization of $24,186 and $22,439, respectively
Finite-Lived Intangible Assets [Line Items]
Purchase and acquired intangible assets	10,564	10,565
Accumulated amortization	$ 24,186	$ 22,439