SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Consolidating Financial Statements, Captions
Net income (loss)	$ (425,391)	$ (42,952)	$ (1,047,960)
Adjustments to reconcile net income to net cash (used in) provided by operating activities	136,497	324,474	1,131,823
Net cash provided by operating activities	(288,894)	281,522	83,863
Capital expenditures	(42,050)	(51,832)	(80,047)
Reimbursement Revenue			0
Proceeds from sale of assets	83,082	86,187	6,069
Acquisitions, net of cash acquired	(2,818)	9	(54,051)
Net cash used in investing activities	38,214	34,364	(128,029)
Net increase (decrease) in revolving credit facility	82,888	(110,000)	(8,256)
Proceeds on issuance of debt	544,243	24,400	134,797
Retirements and repayments of debt	(387,373)	(144,144)	(80,917)
Payment of deferred financing costs	(17,729)	(14,034)	(185)
Dividends paid	(7,943)	(7,927)	(7,889)
Receipt (Repayment) of Government Grants		(14,570)	(5,000)
Repurchase of restricted shares for minimum tax obligation	(483)	(182)	(96)
Intercompany financing and advances	0	0	0
Net cash (used in) provided by financing activities	213,603	(266,457)	32,454
Effect of exchange rate changes on cash and cash equivalents	3,263	(780)	79
Net change in cash and cash equivalents	(33,814)	48,649	(11,633)
Cash at beginning of period	69,633	20,984	32,617
Cash at end of period	35,819	69,633	20,984
Parent
Consolidating Financial Statements, Captions
Net income (loss)	(38,396)	(25,700)	74,173
Adjustments to reconcile net income to net cash (used in) provided by operating activities	(25,181)	36,295	(106,837)
Net cash provided by operating activities	(63,577)	10,595	(32,664)
Capital expenditures	(4,179)	(2,281)	(986)
Reimbursement Revenue			0
Proceeds from sale of assets	0	45,288	0
Acquisitions, net of cash acquired	0	0	0
Net cash used in investing activities	(4,179)	43,007	(986)
Net increase (decrease) in revolving credit facility	82,888	(110,000)	(8,256)
Proceeds on issuance of debt	500,000	0	0
Retirements and repayments of debt	(314,999)	(28,473)	(19,024)
Payment of deferred financing costs	(17,729)	(14,034)	(185)
Dividends paid	(7,943)	(7,927)	(7,889)
Receipt (Repayment) of Government Grants		0	0
Repurchase of restricted shares for minimum tax obligation	(483)	(182)	(96)
Intercompany financing and advances	(193,876)	125,412	70,024
Net cash (used in) provided by financing activities	47,858	(35,204)	34,574
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	(19,898)	18,398	924
Cash at beginning of period	19,942	1,544	620
Cash at end of period	44	19,942	1,544
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Net income (loss)	(313,348)	(37,037)	(1,104,311)
Adjustments to reconcile net income to net cash (used in) provided by operating activities	93,849	260,469	1,207,850
Net cash provided by operating activities	(219,499)	223,432	103,539
Capital expenditures	(32,445)	(37,436)	(57,503)
Reimbursement Revenue			0
Proceeds from sale of assets	82,445	23,316	5,877
Acquisitions, net of cash acquired	0	9	(48,051)
Net cash used in investing activities	50,000	(14,111)	(99,677)
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	743	0	6,497
Retirements and repayments of debt	(23,774)	(12,871)	(24,893)
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants		(14,570)	(5,000)
Repurchase of restricted shares for minimum tax obligation	0	0	0
Intercompany financing and advances	168,393	(157,944)	19,316
Net cash (used in) provided by financing activities	145,362	(185,385)	(4,080)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	(24,137)	23,936	(218)
Cash at beginning of period	24,137	201	419
Cash at end of period	0	24,137	201
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Net income (loss)	(73,647)	19,785	(17,822)
Adjustments to reconcile net income to net cash (used in) provided by operating activities	65,048	12,443	24,629
Net cash provided by operating activities	(8,599)	32,228	6,807
Capital expenditures	(5,426)	(12,115)	(21,558)
Reimbursement Revenue			0
Proceeds from sale of assets	637	17,583	192
Acquisitions, net of cash acquired	(2,818)	0	(6,000)
Net cash used in investing activities	(7,607)	5,468	(27,366)
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	43,500	24,400	128,300
Retirements and repayments of debt	(48,600)	(102,800)	(37,000)
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants		0	0
Repurchase of restricted shares for minimum tax obligation	0	0	0
Intercompany financing and advances	28,264	47,799	(83,159)
Net cash (used in) provided by financing activities	23,164	(30,601)	8,141
Effect of exchange rate changes on cash and cash equivalents	3,263	(780)	79
Net change in cash and cash equivalents	10,221	6,315	(12,339)
Cash at beginning of period	25,554	19,239	31,578
Cash at end of period	35,775	25,554	19,239
Consolidation, Eliminations [Member]
Consolidating Financial Statements, Captions
Net income (loss)	0	0	0
Adjustments to reconcile net income to net cash (used in) provided by operating activities	2,781	15,267	6,181
Net cash provided by operating activities	2,781	15,267	6,181
Capital expenditures	0	0	0
Reimbursement Revenue			0
Proceeds from sale of assets	0	0	0
Acquisitions, net of cash acquired	0	0	0
Net cash used in investing activities	0	0	0
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	0	0	0
Retirements and repayments of debt	0	0	0
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants		0	0
Repurchase of restricted shares for minimum tax obligation	0	0	0
Intercompany financing and advances	(2,781)	(15,267)	(6,181)
Net cash (used in) provided by financing activities	(2,781)	(15,267)	(6,181)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash at beginning of period	0	0	0
Cash at end of period	$ 0	$ 0	$ 0