Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from joint ventures	$ 5,572	$ 463	$ (412)	$ (41,896)	$ (25)	$ 170	$ (356)	$ (572)		$ (36,273)	$ (783)	$ (8,368)
Carrying value of long-term debt	240,000				236,000					240,000	236,000
Long-term debt, fair value	298,000				316,000					298,000	316,000
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charge											0	9,216
Level 1 [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	31,006				35,578					31,006	35,578
Level 1 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in joint ventures									$ 0			0
Level 2 [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	0				0					0	0
Level 2 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in joint ventures									0			0
Level 3 [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	0				0					0	0
Level 3 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in joint ventures									0			0
Estimate of Fair Value Measurement [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	$ 31,006				$ 35,578					$ 31,006	$ 35,578
Net Carrying Value [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in joint ventures													$ 0
Madison Paper Industries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charge												9,200
Loss from joint ventures				$ (41,400)					9,200			$ (4,700)
Loss from joint ventures after tax and adjusted for allocation of loss to noncontrolling interest									$ 4,700