Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Deferred tax assets
Accrued liabilities	$ 19,277,000	$ 12,319,000
Accrued bonuses	4,621,000	3,624,000
Other assets and liabilities	11,488,000	11,109,000
Equity awards	6,866,000	6,494,000
Other	3,662,000	3,730,000
Foreign net operating losses	4,769,000	6,322,000
Valuation allowance on foreign net operating and capital losses and foreign deferred tax assets	(2,866,000)	(2,932,000)
Total deferred tax assets	47,817,000	40,666,000
Deferred tax liabilities
Deferred expenses	(6,861,000)	(6,141,000)
Accelerated depreciation	(21,434,000)	(21,425,000)
Goodwill	(16,752,000)	(15,725,000)
Other	(4,965,000)	(7,401,000)
Total deferred tax liabilities	(50,012,000)	(50,692,000)
Net deferred liability	(2,195,000)	(10,026,000)
Other tax disclosures
Foreign tax net operating loss carryovers	21,900,000	$ 29,700,000
Decrease in valuation allowance	$ 66,000