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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (202,948) $ (168,227) $ (168,557)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 40,394 29,019 17,867
Stock-based compensation expense 59,504 31,929 11,749
Amortization of deferred commissions 15,816 12,079 13,500
Remeasurement of redeemable convertible preferred stock warrant liability   (126) 8,477
Release of deferred tax valuation allowance 0 (1,117) (2,590)
Other 1,089 278 212
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable, net (45,368) (11,487) (25,157)
Deferred commissions (21,725) (16,187) (13,999)
Prepaid expenses and other assets, current and noncurrent (25,717) (2,521) (3,792)
Accounts payable (4,022) 3,231 (3,177)
Accrued expenses and other liabilities 17,943 6,952 24,055
Deferred rent 32,357 1,292 (330)
Deferred revenue 66,356 29,985 49,973
Net cash used in operating activities (66,321) (84,900) (91,769)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of marketable securities (112,521)    
Sales of marketable securities 78,427    
Maturities of marketable securities 26,370    
Purchases of property and equipment (72,939) (38,681) (24,424)
Proceeds from sale of property and equipment 73    
Acquisitions and purchases of intangible assets, net of cash acquired (271) (202) (7,761)
Net cash used in investing activities (80,861) (38,883) (32,185)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from initial public offering, net of offering costs (2,172) 184,237 (588)
Proceeds from borrowings, net of borrowing costs 39,860 12,000 32,744
Principal payments on borrowings (40,000) (6,000) (30,971)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs   149,614 99,944
Proceeds from exercise of redeemable convertible preferred stock warrants     1,033
Proceeds from exercise of stock options, net of repurchases of early exercised stock options 7,015 6,016 3,003
Proceeds from issuances of common stock under employee stock purchase plan 10,282    
Employee payroll taxes paid related to net share settlement of restricted stock units (10,436) (359)  
Payments of capital lease obligations (2,036) (69)  
Net cash provided by financing activities 2,513 345,439 105,165
Effect of exchange rate changes on cash and cash equivalents (26) (71) 15
Net increase (decrease) in cash and cash equivalents (144,695) 221,585 (18,774)
Cash and cash equivalents, beginning of period 330,436 108,851 127,625
Cash and cash equivalents, end of period 185,741 330,436 108,851
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Cash paid for interest, net of amounts capitalized 1,183 1,099 3,461
Cash paid for income taxes, net of tax refunds 832 157 86
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:      
Conversion of redeemable convertible preferred stock to common stock   557,816  
Accretion of redeemable convertible preferred shares 0 11,503 341
Deemed dividend on the conversion of Series F redeemable convertible preferred stock   2,262  
Change in accrued equipment purchases 10,766 2,110 2,768
Purchases of property and equipment under capital lease 13,138 1,952  
Issuance of redeemable convertible preferred stock exercise of warrants   1,220 10,000
Issuance of common stock in connection with acquisitions and purchases of intangible assets 6,108 5,239 5,066
Vesting of early exercised stock options and restricted stock 127 684 1,135
Change in unpaid deferred offering costs $ (2,172) $ 417 $ 1,755