Other Balance Sheet Accounts - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Deferred income taxes, noncurrent, net	$ 7,236	$ 9,275
Long-term deposits	20,126	19,715
Customer contract asset	115	1,447
Other	79,185	76,259
Other assets, net	396,727	452,546
Purchased intangible assets, net of accumulated amortization of $191,807 and $130,968, respectively
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	277,898	329,971
Accumulated amortization	191,807	130,968
Acquired intellectual property, net of accumulated amortization of $20,837 and $15,695, respectively
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	12,167	15,879
Accumulated amortization	$ 20,837	$ 15,695