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Inventories - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Impact of liquidations of previously established LIFO layers on net income	$ 9,500,000	$ 0	$ 0
Impact of liquidations of previously established LIFO layers on diluted earnings per share	$ 0.14

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- Definition

Effect of LIFO inventory liquidation on earnings per share diluted.

+ References

No definition available.

+ Details

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- Definition

The effect of liquidating LIFO (last in first out) inventory layers on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SAB Topic 11.F)
-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729

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- References

No definition available.

+ Details

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