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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Net cash provided by operating activities | $ 14,724 | $ 15,747 |  |
Net cash provided by investing activities | 43,918 | (68,598) |  |
Net cash provided by financing activities | (54,394) | 23,565 |  |
Net increase (decrease) in cash, cash equivalents |  | 0 |  |
Net increase (decrease) in cash, cash equivalents, and restricted cash | 4,248 | (29,286) |  |
Cash and cash equivalents | 16,261 |  | $ 11,891 | $ 0
Restricted cash | 4,103 | 3,713 | 4,225 |
Total cash, cash equivalents and restricted cash | 20,364 | 27,514 | $ 16,116 | 56,800
Escrow Deposits [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restricted cash | $ 4,100 |  |  |
Previously Reported [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net cash provided by operating activities |  | 15,828 |  |
Net cash provided by investing activities |  | (44,544) |  |
Net cash provided by financing activities |  | 23,698 |  |
Net increase (decrease) in cash, cash equivalents |  | (5,018) |  |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | 0 |  |
Cash and cash equivalents |  | 23,801 |  | 28,819
Total cash, cash equivalents and restricted cash |  |  |  | 0
Accounting Standards Update 2016-15 [Member] | Adjustment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net cash provided by operating activities |  | (81) |  |
Net cash provided by investing activities |  | (24,054) |  |
Net cash provided by financing activities |  | (133) |  |
Net increase (decrease) in cash, cash equivalents |  | 5,018 |  |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | (29,286) |  |
Cash and cash equivalents |  |  |  | (28,819)
Total cash, cash equivalents and restricted cash |  | $ 3,713 |  | $ 56,800

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