Interest Rate Swap (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 19, 2021	Sep. 24, 2016	Mar. 31, 2016	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015	Dec. 26, 2015
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 1,800		$ 1,800		$ 1,800
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion				(412)	$ 0	(1,822)	$ 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax				161	0	(711)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax				0	0	0	0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred		900
Fair Value, Option, Changes in Fair Value, Gain (Loss)						(1,111)	0	$ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						0	0	0
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing				306	0	0	0
Other Short-term Borrowings		1,822		1,822	0	1,822	0	0
Interest Rate Swap Inception Date			Mar. 31, 2016
Derivative Liability, Notional Amount		195,000	$ 197,500	195,000		195,000
Other Comprehensive Income (Loss), Net of Tax				251	0	(1,111)	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax		(1,111)		(1,111)	0	(1,111)	0	0
Interest Rate Swap Long Term Portion [Member]
Derivative [Line Items]
Other Short-term Borrowings		935		935	0	935	0	0
Interest Rate Swap Short Term Portion [Member]
Derivative [Line Items]
Other Short-term Borrowings		$ 887		$ 887	$ 0	$ 887	$ 0	$ 0
Subsequent Event [Member]
Derivative [Line Items]
Interest Rate Swap Maturity Date	Feb. 19, 2021