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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - ASU Impact on Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Net cash provided (used) by operating activities | $ 40,034 | $ 55,195 | $ 79,052 | $ 72,261
Net cash provided (used) by investing activities | 51,171 | 80,112 | 224,160 | 128,552
Net cash provided (used) by financing activities | (88,065) | (175,991) | (317,920) | (189,338)
Net increase (decrease) in cash, cash equivalents |  | 0 | 0 | 0
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 3,140 | (40,684) | (14,708) | 11,475
Cash and cash equivalents at beginning of period | 11,891 | 28,819 |  | 0
Cash and cash equivalents at end of period | 13,792 | 11,891 | 28,819 |
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR | 16,116 | 56,800 | 71,508 | 60,033
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF YEAR | 19,256 | 16,116 | 56,800 | 71,508
Previously Reported |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Net cash provided (used) by operating activities |  | 48,035 | 73,930 | 66,493
Net cash provided (used) by investing activities |  | 104,189 | 202,263 | 134,252
Net cash provided (used) by financing activities |  | (169,152) | (314,072) | (183,017)
Net increase (decrease) in cash, cash equivalents |  | (16,928) | (37,879) | 17,728
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH |  | 0 | 0 | 0
Cash and cash equivalents at beginning of period | 11,891 | 28,819 | 66,698 | 48,970
Cash and cash equivalents at end of period |  | 11,891 | 28,819 | 66,698
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR |  |  |  | 0
Accounting Standards Update 2016-15 and 2016-18 | Restatement Adjustment |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Net cash provided (used) by operating activities |  | 7,160 | 5,122 | 5,768
Net cash provided (used) by investing activities |  | (24,077) | 21,897 | (5,700)
Net cash provided (used) by financing activities |  | (6,839) | (3,848) | (6,321)
Net increase (decrease) in cash, cash equivalents |  | 16,928 | 37,879 | (17,728)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH |  | (40,684) | (14,708) | 11,475
Cash and cash equivalents at beginning of period |  |  |  | (48,970)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR | $ 4,225 | 27,981 | 4,810 | 60,033
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF YEAR |  | $ 4,225 | $ 27,981 | $ 4,810

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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