Goodwill and Intangible Assets - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Goodwill [Line Items]
Goodwill impairment loss	$ 41,300,000	$ 0	$ 41,340,000
Impairment of long-lived assets	1,100,000	0
Definite-lived intangible assets, amortization expense		$ 11,300,000	$ 11,200,000	$ 7,800,000
Mexico Reporting Unit | Trade names
Goodwill [Line Items]
Impairment of intangible assets	2,900,000
G P M X Reporting Unit | Trade names
Goodwill [Line Items]
Impairment of intangible assets	$ 1,700,000
Minimum | Goodwill and Indefinite-lived Intangible Assets | Measurement Input, Discount Rate | Income Approach Valuation Technique
Goodwill [Line Items]
Discount rates used for reporting unit valuations		0.11
Maximum | Goodwill and Indefinite-lived Intangible Assets | Measurement Input, Discount Rate | Income Approach Valuation Technique
Goodwill [Line Items]
Discount rates used for reporting unit valuations		0.19