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Net Sales and Operating Earnings Related to Fairborn Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Revenues | $ 359,371 | $ 302,395 | $ 1,101,807 | $ 932,557
Operating Earnings | 105,938 | $ 98,624 | 310,582 | $ 281,916
Fairborn Acquisition [Member] |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Revenues | 21,699 |  | 69,120 |
Operating Earnings | $ 6,547 |  | $ 20,380 |

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