BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASU 2016-18 (Details) - USD ($)
$ in Thousands |
3 Months Ended |
Apr. 30, 2018 |
Apr. 30, 2017 |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
| Net Cash Provided by Operating Activities |
|
$ 59,761
|
| Net Cash Used in Investing Activities |
|
(21,975)
|
| Net Cash Used in Financing Activities |
|
(3,583)
|
| Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations |
|
(1,334)
|
| Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |
$ 42,588
|
32,869
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period |
398,210
|
369,329
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period |
$ 440,798
|
402,198
|
| Scenario, Previously Reported |
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
| Net Cash Provided by Operating Activities |
|
59,761
|
| Net Cash Used in Investing Activities |
|
(22,118)
|
| Net Cash Used in Financing Activities |
|
(3,583)
|
| Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations |
|
(1,332)
|
| Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |
|
32,728
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period |
|
307,363
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period |
|
340,091
|
| Accounting Standards Update 2016-18 |
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
| Net Cash Provided by Operating Activities |
|
0
|
| Net Cash Used in Investing Activities |
|
143
|
| Net Cash Used in Financing Activities |
|
0
|
| Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations |
|
(2)
|
| Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |
|
141
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period |
|
61,966
|
| Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period |
|
$ 62,107
|