Basis of Presentation - Narrative (Details) $ in Thousands					3 Months Ended		12 Months Ended
	Jul. 15, 2020 Store	Jun. 09, 2020 Store	Jun. 08, 2020 Store	May 29, 2020	Sep. 30, 2020 USD ($) Store	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Store	Jul. 10, 2020 USD ($)	May 28, 2020 USD ($)
Change In Accounting Estimate [Line Items]
Number of stores not re-opened							2
Number of stores permanent closure					197
Petition date					May 27, 2020
Maximum ownership transfer allowable				4.50%
Operating losses | $					$ 16,488	$ 8,651	$ 159,200
Change in accounting principle, accounting standards update, adopted [true false]					true
Change in accounting principle, accounting standards update, adoption date					Jul. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect [true false]					true
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201613Member
Phoenix Distribution Center
Change In Accounting Estimate [Line Items]
Abandonment charges | $					$ 4,800
DIP ABL Facility
Change In Accounting Estimate [Line Items]
Revolving credit facility, aggregate principal amount | $									$ 100,000
Maximum number of store locations approving procedures for closing		230
Number of store locations in process to close			132
Number of stores expect to close	65
DIP Term Facility | Secured Debt
Change In Accounting Estimate [Line Items]
Revolving credit facility, aggregate principal amount | $								$ 25,000