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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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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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