Other Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid income taxes	$ 24,329	$ 22,044
Other taxes receivable	28,117	27,341
Prepaid expenses and other current assets	254,179	201,209
Prepaid expenses and other current assets	$ 306,625	$ 250,594