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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$ 50,698	$ 81,909
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(21,813)	(53,073)
Proceeds from Sale of Property, Plant, and Equipment		2,281
Net Cash Used in Investing Activities	(21,813)	(50,792)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility	185,000	30,000
Dividends Paid to Stockholders	(4,499)	(4,790)
Purchase and Retirement of Common Stock	(198,355)	(52,344)
Proceeds from Stock Option Exercises	396	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(866)	(956)
Net Cash Used in Financing Activities	(18,324)	(26,098)
NET INCREASE IN CASH AND CASH EQUIVALENTS	10,561	5,019
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	8,601	48,068
CASH AND CASH EQUIVALENTS AT END OF PERIOD	19,162	53,087
Parent [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	(6,412)	(21,444)
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	185,000	30,000
Dividends Paid to Stockholders	(4,499)	(4,790)
Purchase and Retirement of Common Stock	(198,355)	(52,344)
Proceeds from Stock Option Exercises	396	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(866)	(956)
Intra-entity Activity, net	35,838	52,110
Net Cash Used in Financing Activities	17,514	26,012
NET INCREASE IN CASH AND CASH EQUIVALENTS	11,102	4,541
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	5,779	44,537
CASH AND CASH EQUIVALENTS AT END OF PERIOD	16,881	49,078
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	57,110	103,353
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(21,813)	(53,046)
Proceeds from Sale of Property, Plant, and Equipment		2,281
Net Cash Used in Investing Activities	(21,813)	(50,765)
CASH FLOWS FROM FINANCING ACTIVITIES
Intra-entity Activity, net	(35,838)	(52,110)
Net Cash Used in Financing Activities	(35,838)	(52,110)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(541)	478
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	2,822	3,531
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,281	$ 4,009

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