Borrowings - Credit Agreement (Details) - USD ($) $ in Thousands	Jan. 27, 2017	Jan. 29, 2016	Dec. 31, 2016	Dec. 31, 2015
Term Debt
Term loans			$ 3,098	$ 3,606
Obligations under capital lease			3,269	8,961
Total			6,367	12,567
Revolving Credit Agreement
Credit Agreement
Current borrowing capacity		$ 150,000
Credit facility initial term		364 days
Unused commitment fee (as a percent)		0.75%
Incremental interest rate payable in event of default (as a percent)		2.00%
Amount outstanding under Credit Agreement			$ 0	$ 0
Revolving Credit Agreement | Subsequent Event
Credit Agreement
Current borrowing capacity	$ 150,000
Credit facility initial term	364 days
Revolving Credit Agreement | Federal funds rate
Credit Agreement
Interest, margin over base rate (as a percent)		2.50%