Income Taxes (Details) - USD ($)	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014
Income Taxes [Line Items]
Effective tax rate	9.20%	23.60%
Net deferred tax assets	$ 10,400,000		$ 12,800,000
Current income tax receivable	6,900,000		2,400,000
Estimated tax payments	3,900,000
Current income tax expense	600,000
Current deferred tax liability	2,700,000
Unrecognized tax benefit, if recognized, would affect the effective tax rate	8,900,000		16,400,000
Interest and penalties benefit	0	$ 100,000
Accrued interest and penalties related to unrecognized tax benefits	2,800,000		4,300,000
Expected decrease of gross unrecognized tax benefits, minimum	4,600,000
Other Liabilities
Income Taxes [Line Items]
Accrued interest and penalties related to unrecognized tax benefits	$ 16,100,000		16,100,000
Domestic Tax Authority
Income Taxes [Line Items]
Valuation allowance			108,300,000
Deferred tax assets			$ 96,100,000