Fair Value - Changes in Assets and Liabilities with Inputs Classified within Level 3 of Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 03, 2020	Jun. 28, 2019
Contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		$ 585
Net Realized/Unrealized Losses Included in Earnings		65
Purchases and Issuances		0
Sales and Settlements		(650)
Balance at end of period		0
Common stock warrant liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 12,364	13,129
Net Realized/Unrealized Losses Included in Earnings	14,951	(5,788)
Purchases and Issuances	0	0
Sales and Settlements	0	0
Balance at end of period	$ 27,315	$ 7,341