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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities $ 152,748 $ 160,152
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions (44,851) (18,231)
Acquisition Spending (36,761)  
Net Cash Used in Investing Activities (81,612) (18,231)
CASH FLOWS FROM FINANCING ACTIVITIES    
Decrease in Credit Facility (30,000) (382,000)
Issuance of Long-term Debt   350,000
Payment of Debt Issuance Costs   (6,637)
Dividends Paid to Stockholders (9,709) (9,677)
Purchase and Retirement of Common Stock (24,903) (60,013)
Proceeds from Stock Option Exercises 20,426 12,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,455) (2,965)
Excess Tax Benefits from Share Based Payment Arrangements   5,494
Net Cash Used in Financing Activities (46,641) (92,806)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 24,495 49,115
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,561 5,391
CASH AND CASH EQUIVALENTS AT END OF PERIOD 31,056 54,506
Parent [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 21,447 (78,298)
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions   (233)
Net Cash Used in Investing Activities   (233)
CASH FLOWS FROM FINANCING ACTIVITIES    
Decrease in Credit Facility (30,000) (382,000)
Issuance of Long-term Debt   350,000
Payment of Debt Issuance Costs   (6,637)
Dividends Paid to Stockholders (9,709) (9,677)
Purchase and Retirement of Common Stock (24,903) (60,013)
Proceeds from Stock Option Exercises 20,426 12,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,455) (2,965)
Excess Tax Benefits from Share Based Payment Arrangements   5,494
Intra-entity Activity, net 49,072 220,354
Net Cash Used in Financing Activities 2,431 127,548
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 23,878 49,017
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 5,184 3,507
CASH AND CASH EQUIVALENTS AT END OF PERIOD 29,062 52,524
Guarantor Subsidiaries [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 131,301 238,450
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions (44,851) (17,998)
Acquisition Spending (36,761)  
Net Cash Used in Investing Activities (81,612) (17,998)
CASH FLOWS FROM FINANCING ACTIVITIES    
Intra-entity Activity, net (49,072) (220,354)
Net Cash Used in Financing Activities (49,072) (220,354)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 617 98
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,377 1,884
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 1,994 $ 1,982