Derivative Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 27, 2020 USD ($) instrument	Dec. 29, 2019 USD ($)	Sep. 30, 2018 agreement	Sep. 27, 2020 USD ($) instrument
Derivative [Line Items]
Gains on cash flow hedges recognized in comprehensive income	$ 1,476	$ 1,670
Derivatives not designated as hedging instruments
Derivative [Line Items]
Number of instruments held | instrument	0			0
Interest Rate Swap | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Number of derivative agreements | agreement			5
Notional amount	$ 225,000
Fixed rate	2.79%
Loss to be reclassified during next twelve months	$ 5,700
Interest Rate Swap | Designated as cash flow hedges | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Fair value of interest rate swap agreements	(14,000)			$ (15,500)
Interest Rate Swap 1 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	45,000
Interest Rate Swap 2 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	45,000
Interest Rate Swap 3 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	45,000
Interest Rate Swap 4 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	45,000
Interest Rate Swap 5 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 45,000