Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	$ 936,437
Other comprehensive (loss) income before reclassifications	17,478	$ (14,696)
Amounts reclassified from AOCI	(1,578)	2,730
Balance at end of year	536,028	936,437
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(49,965)	(24,773)
Other comprehensive (loss) income before reclassifications	15,579	(25,192)
Amounts reclassified from AOCI	(3,777)	0
Balance at end of year	(38,163)	(49,965)	$ (24,773)
Unrealized Losses on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(300)	(2,009)
Other comprehensive (loss) income before reclassifications	(389)	400
Amounts reclassified from AOCI	1,536	1,309
Balance at end of year	847	(300)	(2,009)
Minimum Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(23,046)	(28,429)
Other comprehensive (loss) income before reclassifications	1,394	3,962
Amounts reclassified from AOCI	1,042	1,421	1,969
Balance at end of year	(20,610)	(23,046)	(28,429)
Unrealized Gains on Equity Investments [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	380	221
Other comprehensive (loss) income before reclassifications	(1)	159
Amounts reclassified from AOCI	(379)	0
Balance at end of year	0	380	221
Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	5,975	0
Other comprehensive (loss) income before reclassifications	895	5,975
Amounts reclassified from AOCI	0	0
Balance at end of year	6,870	5,975	0
AOCI Attributable to Parent [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(66,956)	(54,990)	(42,923)
Balance at end of year	$ (51,056)	$ (66,956)	$ (54,990)