Income Taxes (Details) (USD $)	4 Months Ended
	Jan. 18, 2015	Jan. 19, 2014
Operating Loss Carryforwards [Line Items]
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	$ 0	$ 0
Effective tax rates	36.10%	37.30%
Gross unrecognized tax benefits associated with uncertain income tax positions	$ 400,000