SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			$ (26,902)	$ (35,334)
Capital expenditures	$ (8,407)	$ (11,764)	(17,302)	(24,317)
Proceeds from asset dispositions	688	269	8,462	42,244
Net cash provided by (used in) investing activities			(8,840)	17,927
Proceeds from borrowings			387	338,018
Debt issuance costs			(2,554)	(6,695)
Repayment of debt			(29,970)	(318,130)
Dividends paid			0	(2,465)
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			(27)	(23)
Dividends paid to noncontrolling interest	(580)		(580)	0
Issuance of common stock			2,830	0
Repurchases for tax withholdings on vesting of equity awards			(1,504)	(548)
Net cash provided by (used in) financing activities			(31,418)	10,157
Effect of exchange rate changes on cash and cash equivalents			(5,272)	7,937
Net increase (decrease) in cash and cash equivalents			(72,432)	687
Cash and cash equivalents at beginning of period			380,223	96,656
Cash and cash equivalents at end of period	307,791	97,343	307,791	97,343
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			0	0
Capital expenditures			0	77,480
Proceeds from asset dispositions			0	(77,480)
Net cash provided by (used in) investing activities			0	0
Proceeds from borrowings			0	0
Debt issuance costs			0	0
Repayment of debt			0	0
Dividends paid			0	0
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest			0
Issuance of common stock			0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			0	0
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(35,375)	(78,756)
Capital expenditures			(1,536)	(6,306)
Proceeds from asset dispositions			0	0
Net cash provided by (used in) investing activities			(1,536)	(6,306)
Proceeds from borrowings			0	107,800
Debt issuance costs			(597)	0
Repayment of debt			(8,841)	(285,946)
Dividends paid			162,941	110,637
Increases (decreases) in cash related to intercompany advances and debt			(158,992)	150,351
Partial prepayment of put/call obligation			(27)	(23)
Dividends paid to noncontrolling interest			0
Issuance of common stock			2,830
Repurchases for tax withholdings on vesting of equity awards			(1,504)	(548)
Net cash provided by (used in) financing activities			(4,190)	82,271
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(41,101)	(2,791)
Cash and cash equivalents at beginning of period			277,176	3,382
Cash and cash equivalents at end of period	236,075	591	236,075	591
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			14,041	32,581
Capital expenditures			(2,499)	(5,814)
Proceeds from asset dispositions			7,528	80,210
Net cash provided by (used in) investing activities			5,029	74,396
Proceeds from borrowings			0	0
Debt issuance costs			(32)	(552)
Repayment of debt			(10,505)	(9,073)
Dividends paid			1,649	0
Increases (decreases) in cash related to intercompany advances and debt			(17,955)	(96,880)
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest			0
Issuance of common stock			0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			(26,843)	(106,505)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(7,773)	472
Cash and cash equivalents at beginning of period			8,904	299
Cash and cash equivalents at end of period	1,131	771	1,131	771
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(5,568)	10,841
Capital expenditures			(13,267)	(89,677)
Proceeds from asset dispositions			934	39,514
Net cash provided by (used in) investing activities			(12,333)	(50,163)
Proceeds from borrowings			387	230,218
Debt issuance costs			(1,925)	(6,143)
Repayment of debt			(10,624)	(23,111)
Dividends paid			(164,590)	(113,102)
Increases (decreases) in cash related to intercompany advances and debt			176,947	(53,471)
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest			(580)
Issuance of common stock			0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			(385)	34,391
Effect of exchange rate changes on cash and cash equivalents			(5,272)	7,937
Net increase (decrease) in cash and cash equivalents			(23,558)	3,006
Cash and cash equivalents at beginning of period			94,143	92,975
Cash and cash equivalents at end of period	$ 70,585	$ 95,981	$ 70,585	$ 95,981