Impairment and Other Charges, Net - Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jul. 05, 2020		Jul. 07, 2019		Jul. 05, 2020	Jul. 07, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 2		$ (64)		$ 1,165	$ 6,722
Employee severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2		287		1,165	5,436
Strategic Alternative Evaluation
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0	[1]	$ (351)	[1]	$ 0	$ 1,286	[1]

[1] Strategic Alternative Evaluation costs primarily relate to third party advisory services.