Derivative Financial Instruments - Narrative (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018 agreement	Jun. 28, 2020 USD ($) instrument	Sep. 29, 2019 USD ($) instrument
Derivatives not designated as hedging instruments
Derivative [Line Items]
Number of instruments held | instrument		0	0
Interest rate swap agreements | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Number of derivative agreements | agreement	5
Notional amount		$ 231,300
Fixed rate		2.79%
Gain (loss) to be reclassified during next twelve months		$ 5,800
Interest rate swap agreements | Designated as cash flow hedges | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Fair value of interest rate swap agreements		(16,600)	$ (10,873)
Interest Rate Swap 1 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount		46,300
Interest Rate Swap 2 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount		46,300
Interest Rate Swap 3 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount		46,300
Interest Rate Swap 4 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount		46,300
Interest Rate Swap 5 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount		$ 46,300