Fair Value Measurements Non-Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 12,257		$ 17,139
Impairment of Long-Lived Assets to be Disposed of	$ 59	$ 1,131	1,211	$ 1,463	2,474
Impairment of long-lived assets	1,513	$ 8,618	13,468	$ 11,224	19,613
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Assets Held and Used, Long Lived, Fair Value Disclosure	5,060		5,060		8,651
Assets Held-for-sale, Long Lived, Fair Value Disclosure	2,663		2,663		4,967
Total	7,723		7,723		13,618
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Assets Held and Used, Long Lived, Fair Value Disclosure	0		0		0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0		0		0
Total	0		0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Assets Held and Used, Long Lived, Fair Value Disclosure	0		0		0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0		0		0
Total	0		0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Assets Held and Used, Long Lived, Fair Value Disclosure	5,060		5,060		8,651
Assets Held-for-sale, Long Lived, Fair Value Disclosure	2,663		2,663		4,967
Total	$ 7,723		$ 7,723		$ 13,618