Derivative Instruments (Narrative) (Details)	4 Months Ended
	Jan. 17, 2016 USD ($)	Jan. 18, 2015 USD ($)	Jun. 15, 2015 USD ($) agreements	Apr. 14, 2014 USD ($) agreements
Derivative [Line Items]
Interest rate derivatives held | agreements			11	9
Interest rate swaps hedge ineffectiveness		$ 0
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 300,000,000
Interest rate swaps hedge ineffectiveness	$ 0
October 2015 through October 2018 | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 200,000,000
October 2018 through October 2022 | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 500,000,000