Summary of Business and Significant Accounting Policies - Schedule of Unaudited Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
Apr. 30, 2018 |
Apr. 30, 2017 |
| Cash flows from operating activities |
|
|
|
| Net income |
$ 44,310
|
$ 36,996
|
[1] |
| Adjustments to reconcile net income to net cash provided by operating activities: |
|
|
|
| Amortization of deferred costs |
4,519
|
4,048
|
[1] |
| Changes in operating assets and liabilities: |
|
|
|
| Accounts receivable |
69,592
|
70,804
|
[1] |
| Unbilled accounts receivable |
(4,287)
|
(7,932)
|
[1] |
| Deferred costs |
(3,551)
|
(3,717)
|
[1] |
| Deferred revenue |
22,650
|
29,411
|
[1] |
| Net cash provided by operating activities |
150,585
|
142,161
|
[1] |
| Net cash (used in) provided by investing activities |
(17,557)
|
(2,304)
|
[1] |
| Net change in cash, cash equivalents and restricted cash |
140,056
|
148,055
|
[1] |
| Cash, cash equivalents, and restricted cash at beginning of period |
321,387
|
218,607
|
[1] |
| Cash, cash equivalents, and restricted cash at end of period |
$ 461,443
|
366,662
|
[1] |
| As Reported [member] | Topic 606 [Member] |
|
|
|
| Cash flows from operating activities |
|
|
|
| Net income |
|
36,023
|
|
| Changes in operating assets and liabilities: |
|
|
|
| Accounts receivable |
|
69,700
|
|
| Deferred revenue |
|
24,437
|
|
| Net cash provided by operating activities |
|
142,161
|
|
| Change in restricted cash and deposits |
|
(1)
|
|
| Net cash (used in) provided by investing activities |
|
(2,305)
|
|
| Net change in cash, cash equivalents and restricted cash |
|
148,054
|
|
| Cash, cash equivalents, and restricted cash at beginning of period |
|
217,606
|
|
| Cash, cash equivalents, and restricted cash at end of period |
|
365,660
|
|
| Adjustments [Member] | Topic 606 [Member] |
|
|
|
| Cash flows from operating activities |
|
|
|
| Net income |
|
973
|
|
| Adjustments to reconcile net income to net cash provided by operating activities: |
|
|
|
| Amortization of deferred costs |
|
4,048
|
|
| Changes in operating assets and liabilities: |
|
|
|
| Accounts receivable |
|
1,104
|
|
| Unbilled accounts receivable |
|
(7,932)
|
|
| Deferred costs |
|
(3,717)
|
|
| Deferred revenue |
|
4,974
|
|
| Change in restricted cash and deposits |
|
1
|
|
| Net cash (used in) provided by investing activities |
|
1
|
|
| Net change in cash, cash equivalents and restricted cash |
|
1
|
|
| Cash, cash equivalents, and restricted cash at beginning of period |
|
1,001
|
|
| Cash, cash equivalents, and restricted cash at end of period |
|
$ 1,002
|
|
|
|