Other Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred income taxes, net	$ 45,738	$ 49,279
Prepaid income taxes	20,847	23,571
Customer contract asset	28,073	77,368
Prepaid expenses and other current assets	192,954	158,962
Total prepaid expenses and other current assets	$ 287,612	$ 309,180