Subsequent Events (Narrative) (Details) - New Term Loan Debt Facility - Senior Notes - USD ($)	Apr. 03, 2018	Sep. 25, 2017	Apr. 27, 2017
Subsequent Event [Line Items]
Debt instrument, face amount		$ 300,000,000	$ 300,000,000
Basis spread on variable rate (percent)		3.25%
Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	1.75%
Savings due to reduction in interest rate	$ 1,500,000.0
Base Rate | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	2.75%
Basis spread increase (decrease) on variable rate (percent)	(0.50%)
LIBOR
Subsequent Event [Line Items]
Basis spread on variable rate (percent)		1.00%
LIBOR | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	1.00%