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Condensed Consolidating Statement of Earnings and Comprehensive Earnings (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Revenue $ 333,285 $ 359,371 $ 1,108,540 $ 1,101,807  
Cost of Goods Sold 252,864 264,805 838,554 824,428  
Gross Profit 80,421 94,566 269,986 277,379  
Equity in Earnings of Unconsolidated Joint Venture 9,507 11,372 28,931 33,203  
Corporate General and Administrative Expense (9,408) (9,883) (27,333) (29,383)  
Legal Settlements   (39,098) (1,800) (39,098)  
Other Non-Operating Income 1,292 1,084 2,291 2,728  
Interest Expense, net (7,294) (6,653) (20,743) (21,592)  
Earnings before Income Taxes 74,518 51,388 251,332 223,237  
Income Taxes (16,803) 49,992 (54,675) (3,613)  
Net Earnings 57,715 101,380 196,657 219,624 $ 256,632
Net Actuarial Change in Benefit Plans, net of tax 56 197 168 591  
Comprehensive Earnings 57,771 101,577 196,825 220,215  
Eliminations [Member]          
Equity in Earnings of Unconsolidated Joint Venture (9,507) (11,372) (28,931) (33,203)  
Equity in Earnings of Subsidiaries (61,946) (138,597) (204,234) (261,389)  
Earnings before Income Taxes (71,453) (149,969) (233,165) (294,592)  
Net Earnings (71,453) (149,969) (233,165) (294,592)  
Net Actuarial Change in Benefit Plans, net of tax (56) (197) (168) (591)  
Comprehensive Earnings (71,509) (150,166) (233,333) (295,183)  
Parent [Member] | Reportable Legal Entities [Member]          
Equity in Earnings of Unconsolidated Joint Venture 9,507 11,372 28,931 33,203  
Equity in Earnings of Subsidiaries 61,946 138,597 204,234 261,389  
Corporate General and Administrative Expense (8,863) (9,035) (24,682) (26,861)  
Legal Settlements   (39,098)   (39,098)  
Other Non-Operating Income (43) 262 (262) (84)  
Interest Expense, net (7,282) (17,005) (20,706) (43,800)  
Earnings before Income Taxes 55,265 85,093 187,515 184,749  
Income Taxes 2,450 16,287 9,142 34,875  
Net Earnings 57,715 101,380 196,657 219,624  
Net Actuarial Change in Benefit Plans, net of tax 56 197 168 591  
Comprehensive Earnings 57,771 101,577 196,825 220,215  
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]          
Revenue 333,285 359,371 1,108,540 1,101,807  
Cost of Goods Sold 252,864 264,805 838,554 824,428  
Gross Profit 80,421 94,566 269,986 277,379  
Equity in Earnings of Unconsolidated Joint Venture 9,507 11,372 28,931 33,203  
Corporate General and Administrative Expense (545) (848) (2,651) (2,522)  
Legal Settlements     (1,800)    
Other Non-Operating Income 1,335 822 2,553 2,812  
Interest Expense, net (12) 10,352 (37) 22,208  
Earnings before Income Taxes 90,706 116,264 296,982 333,080  
Income Taxes (19,253) 33,705 (63,817) (38,488)  
Net Earnings 71,453 149,969 233,165 294,592  
Net Actuarial Change in Benefit Plans, net of tax 56 197 168 591  
Comprehensive Earnings $ 71,509 $ 150,166 $ 233,333 $ 295,183