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Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities $ 54,083 $ 20,615
CASH FLOWS FROM INVESTING ACTIVITIES    
Additions to Property, Plant and Equipment (8,978) (27,122)
Net Cash Used in Investing Activities (8,978) (27,122)
CASH FLOWS FROM FINANCING ACTIVITIES    
Increase in Credit Facility (9,000) 11,000
Dividends Paid to Stockholders (4,828) (5,025)
Purchase and Retirement of Common Stock (39,135)  
Proceeds from Stock Option Exercises 10,632 950
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,284) (1,523)
Excess Tax Benefits from Share Based Payment Arrangements 3,299 1,142
Net Cash Provided by (Used in) Financing Activities (41,316) 6,544
NET INCREASE IN CASH AND CASH EQUIVALENTS 3,789 37
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 5,391 7,514
CASH AND CASH EQUIVALENTS AT END OF PERIOD 9,180 7,551
Parent [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities (35,457) (35,394)
CASH FLOWS FROM FINANCING ACTIVITIES    
Increase in Credit Facility (9,000) 11,000
Dividends Paid to Stockholders (4,828) (5,025)
Purchase and Retirement of Common Stock (39,135)  
Proceeds from Stock Option Exercises 10,632 950
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,284) (1,523)
Excess Tax Benefits from Share Based Payment Arrangements 3,299 1,142
Intra-entity Activity, net 77,474 30,048
Net Cash Provided by (Used in) Financing Activities 36,158 36,592
NET INCREASE IN CASH AND CASH EQUIVALENTS 701 1,198
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,507 3,644
CASH AND CASH EQUIVALENTS AT END OF PERIOD 4,208 4,482
Guarantor Subsidiaries [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Cash Provided by (Used in) Operating Activities 89,540 56,009
CASH FLOWS FROM INVESTING ACTIVITIES    
Additions to Property, Plant and Equipment (8,978) (27,122)
Net Cash Used in Investing Activities (8,978) (27,122)
CASH FLOWS FROM FINANCING ACTIVITIES    
Intra-entity Activity, net (77,474) (30,048)
Net Cash Provided by (Used in) Financing Activities (77,474) (30,048)
NET INCREASE IN CASH AND CASH EQUIVALENTS 3,088 (1,161)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,884 3,870
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,972 $ 2,709