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Revenue - Financial Statement Impact of ASC 606 (Cash Flow) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Jan. 31, 2018 | Jan. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net loss | $ (36,637) | $ (40,086) |  |
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |
Amortization of deferred commissions | 3,675 | 4,990 |  |
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable, net | 71,690 | 37,346 |  |
Deferred commissions | (4,716) | (2,784) |  |
Deferred revenue | (24,160) | (17,669) |  |
Net cash provided by operating activities | 18,440 | $ 8,541 | $ 61,800 | $ (1,200)
Balances without adoption of ASC Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net loss | (38,131) |  |  |
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |
Amortization of deferred commissions | 5,962 |  |  |
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable, net | 71,304 |  |  |
Deferred commissions | (2,763) |  |  |
Deferred revenue | (26,520) |  |  |
Net cash provided by operating activities | 18,440 |  |  |
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net loss | 1,494 |  |  |
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |
Amortization of deferred commissions | (2,287) |  |  |
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable, net | 386 |  |  |
Deferred commissions | (1,953) |  |  |
Deferred revenue | $ 2,360 |  |  |

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