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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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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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