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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities			$ 294,100	$ 275,140
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	$ (33,002)	$ (33,607)	(126,446)	(83,698)
Proceeds from Sale of Property, Plant, and Equipment			2,281
Acquisition Spending				(36,761)
Net Cash Used in Investing Activities			(124,165)	(120,459)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility			5,000	(40,000)
Repayment of Private Placement Senior Unsecured Notes				(81,214)
Dividends Paid to Stockholders			(14,293)	(14,571)
Purchase and Retirement of Common Stock			(191,800)	(24,903)
Proceeds from Stock Option Exercises			1,992	23,729
Shares Redeemed to Settle Employee Taxes on Stock Compensation			(1,842)	(2,607)
Net Cash Used in Financing Activities			(200,943)	(139,566)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH			(31,008)	15,115
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	17,060	21,676	17,060	21,676
Parent [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities			(68,752)	981
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment			(5,023)	(142)
Net Cash Used in Investing Activities			(5,023)	(142)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility			5,000	(40,000)
Repayment of Private Placement Senior Unsecured Notes				(81,214)
Dividends Paid to Stockholders			(14,293)	(14,571)
Purchase and Retirement of Common Stock			(191,800)	(24,903)
Proceeds from Stock Option Exercises			1,992	23,729
Shares Redeemed to Settle Employee Taxes on Stock Compensation			(1,842)	(2,607)
Intra-entity Activity, net			245,683	151,621
Net Cash Used in Financing Activities			44,740	12,055
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH			(29,035)	12,894
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	15,502	18,078	15,502	18,078
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities			362,852	274,159
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment			(121,423)	(83,556)
Proceeds from Sale of Property, Plant, and Equipment			2,281
Acquisition Spending				(36,761)
Net Cash Used in Investing Activities			(119,142)	(120,317)
CASH FLOWS FROM FINANCING ACTIVITIES
Intra-entity Activity, net			(245,683)	(151,621)
Net Cash Used in Financing Activities			(245,683)	(151,621)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH			(1,973)	2,221
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	$ 1,558	$ 3,598	$ 1,558	$ 3,598

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