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Acquisition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 27, 2017	Feb. 10, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Business Acquisition [Line Items]
Operating earnings			$ 108,709	$ 103,357	$ 204,644	$ 183,292
Purchase price paid for business acquisition					36,761
Goodwill			205,211		$ 205,211		$ 198,370
Fairborn Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, date of acquisition					Feb. 10, 2017
Business acquisition purchase price		$ 400,500
Depreciation and amortization					$ 7,200
Operating earnings			$ 7,855		13,833
Direct acquisition cost							$ 5,500
Property and equipment		314,897
Goodwill		$ 64,485
Fairborn Acquisition [Member] | Fair Value Adjustment to Inventory [Member]
Business Acquisition [Line Items]
Operating earnings					$ 600
Wildcat Minerals LLC [Member]
Business Acquisition [Line Items]
Business acquisition, effective date of acquisition					Jul. 27, 2017
Purchase price paid for business acquisition	$ 36,800
Current assets	3,100
Property and equipment	28,300
Intangible and other assets	1,400
Current liabilities	2,800
Goodwill	$ 6,800

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

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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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Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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