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Net Sales and Operating Earnings Related to Fairborn Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Revenues | $ 376,315 | $ 332,658 | $ 742,436 | $ 630,162
Operating Earnings | 108,709 | $ 103,357 | 204,644 | $ 183,292
Fairborn Acquisition [Member] |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Revenues | 25,266 |  | 47,421 |
Operating Earnings | $ 7,855 |  | $ 13,833 |

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