Other Balance Sheet Accounts - Schedule of Capitalized Software Costs (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 414,035	$ 433,398
Capitalized internal-use software development costs, net of accumulated amortization of $159,880 and $136,314, respectively
Property, Plant and Equipment [Line Items]
Capitalized software costs	109,022	96,617
Accumulated amortization	159,880	136,314
Acquired developed technology, net of accumulated amortization of $437,137 and $392,736, respectively
Property, Plant and Equipment [Line Items]
Capitalized software costs	305,013	336,781
Accumulated amortization	$ 437,137	$ 392,736