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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$ 81,909	$ 53,670
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(53,073)	(16,160)
Proceeds from Sale of Property, Plant, and Equipment	2,281
Net Cash Used in Investing Activities	(50,792)	(16,160)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility	30,000	(25,000)
Dividends Paid to Stockholders	(4,790)	(4,853)
Purchase and Retirement of Common Stock	(52,344)	(1,880)
Proceeds from Stock Option Exercises	1,992	1,273
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(956)	(1,378)
Net Cash Used in Financing Activities	(26,098)	(31,838)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	5,019	5,672
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	48,068	6,561
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	53,087	12,233
Parent [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	(21,444)	16,506
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(27)
Net Cash Used in Investing Activities	(27)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility	30,000	(25,000)
Dividends Paid to Stockholders	(4,790)	(4,853)
Purchase and Retirement of Common Stock	(52,344)	(1,880)
Proceeds from Stock Option Exercises	1,992	1,273
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(956)	(1,378)
Intra-entity Activity, net	52,110	20,830
Net Cash Used in Financing Activities	26,012	(11,008)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	4,541	5,498
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	44,537	5,184
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	49,078	10,682
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	103,353	37,164
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(53,046)	(16,160)
Proceeds from Sale of Property, Plant, and Equipment	2,281
Net Cash Used in Investing Activities	(50,765)	(16,160)
CASH FLOWS FROM FINANCING ACTIVITIES
Intra-entity Activity, net	(52,110)	(20,830)
Net Cash Used in Financing Activities	(52,110)	(20,830)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	478	174
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	3,531	1,377
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 4,009	$ 1,551

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