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Net Sales and Operating Loss Related to Fairborn Acquisition (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
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
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
Operating Income (Loss)									$ 382,175	354,431	$ 270,700
Fairborn Acquisition [Member]
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Revenue										7,022
Operating Income (Loss)										$ (2,394)

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

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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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