Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011 segment Y M W	Sep. 25, 2010	Dec. 25, 2010
Inventories
Inventory valued at the lower of cost, determined on the last-in, first-out (LIFO) method, or market (as a percent)	36.00%		36.00%
Excess of replacement cost of inventories over the LIFO value	$ 50,775		$ 50,775		$ 42,559
Raw materials and purchased parts	193,469		193,469		133,380
Work-in-process	28,939		28,939		25,891
Finished goods and manufactured goods	205,892		205,892		163,511
Subtotal	428,300		428,300		322,782
LIFO reserve	50,775		50,775		42,559
Net inventory	377,525		377,525		280,223
Stock Plans
Shares of common stock available for issuance under the plans (in shares)	861,939		861,939
Vesting period, minimum			First anniversary from date of grant
Vesting period, maximum			Fifth anniversary from date of grant
Ratable amount vesting annually, low end of the range (in years)			3
Ratable amount vesting annually, high end of the range (in years)			6
Expiration period, low end of the range (in years)			6
Expiration period, high end of the range (in years)			10
Stock-based compensation plans expenses and income tax benefits
Compensation expense	1,265	1,218	3,732	3,675
Income tax benefits	$ 487	$ 469	$ 1,437	$ 1,415