SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			$ (35,334)	$ 28,795
Capital expenditures	$ (11,764)	$ (80,803)	(24,317)	(101,866)
Proceeds from asset dispositions	269	329	42,244	11,819
Net cash provided by (used in) investing activities			17,927	(90,047)
Proceeds from borrowings			338,018	195,954
Debt issuance costs			(6,695)	(2,925)
Repayment of debt			(318,130)	(120,966)
Dividends paid			(2,465)	(4,910)
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			(23)	(25)
Payment of contingent consideration			0	(10,000)
Repurchases for tax withholdings on vesting of equity awards			(548)	(757)
Net cash provided by financing activities			10,157	56,371
Effect of exchange rate changes on cash and cash equivalents			7,937	1,239
Net increase (decrease) in cash and cash equivalents			687	(3,642)
Cash and cash equivalents at beginning of period			96,656	104,310
Cash and cash equivalents at end of period	97,343	100,668	97,343	100,668
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			0	(631)
Capital expenditures			77,480	0
Proceeds from asset dispositions			(77,480)	0
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
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by 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	(631)
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	(631)	0	(631)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(78,756)	(35,861)
Capital expenditures			(6,306)	(11,958)
Proceeds from asset dispositions			0	0
Net cash provided by (used in) investing activities			(6,306)	(11,958)
Proceeds from borrowings			107,800	191,501
Debt issuance costs			0	(2,925)
Repayment of debt			(285,946)	(116,051)
Dividends paid			110,637	(4,554)
Increases (decreases) in cash related to intercompany advances and debt			150,351	(54,611)
Partial prepayment of put/call obligation			(23)	(25)
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			(548)	(757)
Net cash provided by financing activities			82,271	12,578
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(2,791)	(35,241)
Cash and cash equivalents at beginning of period			3,382	35,241
Cash and cash equivalents at end of period	591	0	591	0
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			32,581	56,788
Capital expenditures			(5,814)	(20,411)
Proceeds from asset dispositions			80,210	10,374
Net cash provided by (used in) investing activities			74,396	(10,037)
Proceeds from borrowings			0	0
Debt issuance costs			(552)	0
Repayment of debt			(9,073)	0
Dividends paid			0	4
Increases (decreases) in cash related to intercompany advances and debt			(96,880)	(49,136)
Partial prepayment of put/call obligation			0	0
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by financing activities			(106,505)	(49,132)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			472	(2,381)
Cash and cash equivalents at beginning of period			299	3,393
Cash and cash equivalents at end of period	771	1,012	771	1,012
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			10,841	8,499
Capital expenditures			(89,677)	(69,497)
Proceeds from asset dispositions			39,514	1,445
Net cash provided by (used in) investing activities			(50,163)	(68,052)
Proceeds from borrowings			230,218	4,453
Debt issuance costs			(6,143)	0
Repayment of debt			(23,111)	(4,915)
Dividends paid			(113,102)	(360)
Increases (decreases) in cash related to intercompany advances and debt			(53,471)	103,747
Partial prepayment of put/call obligation			0	0
Payment of contingent consideration				(10,000)
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by financing activities			34,391	92,925
Effect of exchange rate changes on cash and cash equivalents			7,937	1,239
Net increase (decrease) in cash and cash equivalents			3,006	34,611
Cash and cash equivalents at beginning of period			92,975	65,676
Cash and cash equivalents at end of period	$ 95,981	$ 100,287	$ 95,981	$ 100,287