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Condensed Consolidating Statement of Earnings and Comprehensive Earnings (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues $ 376,315 $ 332,658 $ 742,436 $ 630,162
Cost of Goods Sold 279,561 241,448 559,623 466,997
Gross Profit 96,754 91,210 182,813 163,165
Equity in Earnings of Unconsolidated Joint Venture 11,955 12,147 21,831 20,127
Corporate General and Administrative Expenses (9,821) (8,832) (19,500) (18,665)
Other Income (Loss) 887 504 1,644 1,579
Interest Expense, net (7,456) (5,656) (14,939) (9,557)
Earnings Before Income Taxes 92,319 89,373 171,849 156,649
Income Taxes (28,957) (29,136) (53,605) (51,068)
Net Earnings 63,362 60,237 118,244 105,581
Net Actuarial Change in Benefit Plans, net of tax 197 312 394 624
Comprehensive Earnings 63,559 60,549 118,638 106,205
Eliminations [Member]        
Equity in Earnings of Unconsolidated Joint Venture (11,955) (12,147) (21,831) (20,127)
Equity in Earnings of Subsidiaries (64,496) (61,469) (122,792) (111,172)
Earnings Before Income Taxes (76,451) (73,616) (144,623) (131,299)
Net Earnings (76,451) (73,616) (144,623) (131,299)
Net Actuarial Change in Benefit Plans, net of tax (197) (312) (394) (624)
Comprehensive Earnings (76,648) (73,928) (145,017) (131,923)
Parent [Member]        
Equity in Earnings of Unconsolidated Joint Venture 11,955 12,147 21,831 20,127
Equity in Earnings of Subsidiaries 64,496 61,469 122,792 111,172
Corporate General and Administrative Expenses (9,178) (7,497) (17,826) (15,728)
Other Income (Loss) (179) (137) (346) (214)
Interest Expense, net (13,833) (12,354) (26,795) (22,365)
Earnings Before Income Taxes 53,261 53,628 99,656 92,992
Income Taxes 10,101 6,609 18,588 12,589
Net Earnings 63,362 60,237 118,244 105,581
Net Actuarial Change in Benefit Plans, net of tax 197 312 394 624
Comprehensive Earnings 63,559 60,549 118,638 106,205
Guarantor Subsidiaries [Member]        
Revenues 376,315 332,658 742,436 630,162
Cost of Goods Sold 279,561 241,448 559,623 466,997
Gross Profit 96,754 91,210 182,813 163,165
Equity in Earnings of Unconsolidated Joint Venture 11,955 12,147 21,831 20,127
Corporate General and Administrative Expenses (643) (1,335) (1,674) (2,937)
Other Income (Loss) 1,066 641 1,990 1,793
Interest Expense, net 6,377 6,698 11,856 12,808
Earnings Before Income Taxes 115,509 109,361 216,816 194,956
Income Taxes (39,058) (35,745) (72,193) (63,657)
Net Earnings 76,451 73,616 144,623 131,299
Net Actuarial Change in Benefit Plans, net of tax 197 312 394 624
Comprehensive Earnings $ 76,648 $ 73,928 $ 145,017 $ 131,923