Debt and Credit Arrangements - Interest Rate Swaps (Details) $ in Thousands	12 Months Ended
	Dec. 27, 2015 USD ($) item	Jun. 28, 2015 item	Dec. 28, 2014 USD ($)
Not designated as a hedge
Debt and Credit Arrangements
Number of derivatives held | item	0
Interest rate swap
Debt and Credit Arrangements
Gain (loss) on cash flow hedge ineffectiveness | $	$ 0
Number of derivatives held | item		2
Interest rate swap | Other current and long-term Liabilities
Debt and Credit Arrangements
Derivatives designated as hedging instruments, fair value | $	$ 2,262		$ 376