Fair Value Disclosures - Additional Information (Detail) - store	1 Months Ended	6 Months Ended
	Nov. 06, 2020	Mar. 31, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Number of operating stores held-for-sale			16
Forecast [Member]
Subsequent Event [Line Items]
Number of stores expected to close		30
Subsequent Event
Subsequent Event [Line Items]
Number of operating stores classified as held-for-sale during period	14