Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

Leases - Additional Information (Detail) - Railcars [Member] - USD ($)	Dec. 31, 2022	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Leases not yet commenced		$ 7,787,000
Forecast [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	10 years
Forecast [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	1 year