Other Balance Sheet Accounts - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Accounts payable	$ 148,279	$ 115,257
Accrued compensation	517,433	730,390
Non-cash equity liability	55,394	68,355
Accrued other liabilities	452,398	419,299
Accrued income and other taxes payable	196,670	239,699
Accrued professional costs	46,579	38,254
Accrued rent	21,384	19,710
Capital lease obligation, current	118,888	102,106
Financing obligation - leased facility, current	19,797	19,594
Accrued expenses and other current liabilities	$ 1,576,822	$ 1,752,664