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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2016-15 (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017
Business Acquisition [Line Items] |  |
Net cash provided by operating activities | $ 27,214 | $ 27,733
Net cash provided by (used by) investing activities | 43,727 | (119,702)
Net cash provided by (used by) financing activities | (69,195) | 81,415
Net increase (decrease) in cash, cash equivalents |  | 0
Net increase (decrease) in cash, cash equivalents, and restricted cash | 1,746 | (10,554)
Cash and cash equivalents at beginning of period | 11,891 | 0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD | 16,116 | 56,800
Cash and cash equivalents at end of period | 12,777 |
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD | $ 17,862 | 46,246
Previously Reported [Member] |  |
Business Acquisition [Line Items] |  |
Net cash provided by operating activities |  | 26,932
Net cash provided by (used by) investing activities |  | (95,112)
Net cash provided by (used by) financing activities |  | 81,825
Net increase (decrease) in cash, cash equivalents |  | 13,645
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | 0
Cash and cash equivalents at beginning of period |  | 28,819
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD |  | 0
Cash and cash equivalents at end of period |  | 42,464
Adjustment [Member] | Accounting Standards Update 2016-15 [Member] |  |
Business Acquisition [Line Items] |  |
Net cash provided by operating activities |  | 801
Net cash provided by (used by) investing activities |  | (24,590)
Net cash provided by (used by) financing activities |  | (410)
Net increase (decrease) in cash, cash equivalents |  | (13,645)
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | (10,554)
Cash and cash equivalents at beginning of period |  | (28,819)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD |  | 56,800
Cash and cash equivalents at end of period |  |
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD |  | $ 3,782

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