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Condensed Consolidating Statement of Earnings and Comprehensive Earnings (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenue | $ 284,713 | $ 359,371 | $ 376,315 | $ 366,121 | $ 278,663 | $ 302,395 | $ 332,658 | $ 297,504 | $ 1,386,520 | $ 1,211,220 | $ 1,143,492
Cost of Goods Sold |  |  |  |  |  |  |  |  | 1,047,764 | 899,175 | 911,875
Gross Profit | 61,377 | 94,566 | 96,754 | 86,059 | 61,500 | 87,380 | 91,210 | 71,955 | 338,756 | 312,045 | 231,617
Equity in Earnings of Unconsolidated Joint Venture |  |  |  |  |  |  |  |  | 43,419 | 42,386 | 39,083
Corporate General and Administrative Expense |  |  |  |  |  |  |  |  | (41,205) | (33,940) | (37,193)
Legal Settlements |  |  |  |  |  |  |  |  | (45,098) |  |
Other Non-Operating Income |  |  |  |  |  |  |  |  | 3,728 | 2,139 | 2,328
Acquisition-Related Expense |  |  |  |  |  |  |  |  |  | (5,480) |
Interest Expense, net |  |  |  |  |  |  |  |  | (27,638) | (22,631) | (16,583)
Earnings before Income Taxes | 48,725 | 51,388 | 92,319 | 79,530 | 54,181 | 83,689 | 89,373 | 67,276 | 271,962 | 294,519 | 219,252
Income Taxes |  |  |  |  |  |  |  |  | (15,330) | (96,300) | (66,660)
Net Earnings | $ 37,008 | $ 101,380 | $ 63,362 | $ 54,882 | $ 36,251 | $ 56,387 | $ 60,237 | $ 45,344 | 256,632 | 198,219 | 152,592
Net Actuarial Change in Benefit Plans, net of tax |  |  |  |  |  |  |  |  | 3,384 | 4,013 | 658
Comprehensive Earnings |  |  |  |  |  |  |  |  | 260,016 | 202,232 | 153,250
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Unconsolidated Joint Venture |  |  |  |  |  |  |  |  | (43,419) | (42,386) | (39,083)
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | (289,950) | (210,923) | (160,018)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | (333,369) | (253,309) | (199,101)
Net Earnings |  |  |  |  |  |  |  |  | (333,369) | (253,309) | (199,101)
Net Actuarial Change in Benefit Plans, net of tax |  |  |  |  |  |  |  |  | (3,384) | (4,013) | (658)
Comprehensive Earnings |  |  |  |  |  |  |  |  | (336,753) | (257,322) | (199,759)
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Unconsolidated Joint Venture |  |  |  |  |  |  |  |  | 43,419 | 42,386 | 39,083
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 289,950 | 210,923 | 160,018
Corporate General and Administrative Expense |  |  |  |  |  |  |  |  | (37,825) | (28,545) | (32,047)
Legal Settlements |  |  |  |  |  |  |  |  | (45,098) |  |
Other Non-Operating Income |  |  |  |  |  |  |  |  | (233) | (534) | (398)
Acquisition-Related Expense |  |  |  |  |  |  |  |  |  | (5,480) |
Interest Expense, net |  |  |  |  |  |  |  |  | (27,609) | (51,315) | (39,038)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 222,604 | 167,435 | 127,618
Income Taxes |  |  |  |  |  |  |  |  | 34,028 | 30,784 | 24,974
Net Earnings |  |  |  |  |  |  |  |  | 256,632 | 198,219 | 152,592
Net Actuarial Change in Benefit Plans, net of tax |  |  |  |  |  |  |  |  | 3,384 | 4,013 | 658
Comprehensive Earnings |  |  |  |  |  |  |  |  | 260,016 | 202,232 | 153,250
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,386,520 | 1,211,220 | 1,143,492
Cost of Goods Sold |  |  |  |  |  |  |  |  | 1,047,764 | 899,175 | 911,875
Gross Profit |  |  |  |  |  |  |  |  | 338,756 | 312,045 | 231,617
Equity in Earnings of Unconsolidated Joint Venture |  |  |  |  |  |  |  |  | 43,419 | 42,386 | 39,083
Corporate General and Administrative Expense |  |  |  |  |  |  |  |  | (3,380) | (5,395) | (5,146)
Other Non-Operating Income |  |  |  |  |  |  |  |  | 3,961 | 2,673 | 2,726
Acquisition-Related Expense |  |  |  |  |  |  |  |  |  | 0 |
Interest Expense, net |  |  |  |  |  |  |  |  | (29) | 28,684 | 22,455
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 382,727 | 380,393 | 290,735
Income Taxes |  |  |  |  |  |  |  |  | (49,358) | (127,084) | (91,634)
Net Earnings |  |  |  |  |  |  |  |  | 333,369 | 253,309 | 199,101
Net Actuarial Change in Benefit Plans, net of tax |  |  |  |  |  |  |  |  | 3,384 | 4,013 | 658
Comprehensive Earnings |  |  |  |  |  |  |  |  | $ 336,753 | $ 257,322 | $ 199,759

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