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Acquisition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Jul. 27, 2017	Feb. 10, 2017	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Business Acquisition [Line Items]
Operating earnings			$ 96,692	$ 81,010
Fairborn Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, date of acquisition			Feb. 10, 2017
Business acquisition purchase price		$ 400,500
Depreciation and amortization			$ 3,300
Operating earnings			5,978
Direct acquisition cost					$ 5,500
Fairborn Acquisition [Member] | Fair Value Adjustment to Inventory
Business Acquisition [Line Items]
Operating earnings			$ 600
Wildcat Minerals L L C
Business Acquisition [Line Items]
Business acquisition, effective date of acquisition			Jul. 27, 2017
Wildcat Minerals L L C | Subsequent Event [Member]
Business Acquisition [Line Items]
Purchase price paid for business acquisition	$ 37,000

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Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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