Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 26, 2014		Sep. 27, 2013		Sep. 26, 2014		Sep. 27, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 14,779		$ 19,179		$ 42,809		$ 44,225
Foreign currency translation adjustments	(5,766)		4,669		(4,306)		(89)
Unrealized gain on derivative instruments, net of tax expense (benefit) of $6 and $(74), and $47 and $(36), respectively	6	[1]	(119)	[1]	75	[1]	(58)	[1]
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $405 and $941, and $1,215 and $2,751, respectively	669	[2]	1,536	[2]	2,006	[2]	4,487	[2]
Other Comprehensive Income (Loss)	(5,091)		6,086		(2,225)		4,340
Comprehensive Income	$ 9,688		$ 25,265		$ 40,584		$ 48,565

[1] See Note 7, Derivative Financial Instruments, for additional information regarding our derivative instruments.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 10, Pension Plans for additional information.)