Long-Term Debt (Schedule Of Revolving Credit Facility) (Details) (USD $)			0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended		0 Months Ended
	Mar. 30, 2012	Dec. 31, 2011	Jul. 22, 2011 North America [Member] Asset Based Revolving Credit Facility [Member]	Mar. 30, 2012 North America [Member] Asset Based Revolving Credit Facility [Member]	Dec. 31, 2011 North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 North America [Member] Terminated Credit Facility [Member]	Sep. 30, 2011 North America [Member] Terminated Credit Facility [Member]	Jul. 22, 2011 CANADA [Member] Asset Based Revolving Credit Facility [Member]	Mar. 30, 2012 Potential Increase [Member] North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Minimum [Member] North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Maximum [Member] North America [Member] Asset Based Revolving Credit Facility [Member]
Credit facility maximum borrowing capacity			$ 400,000,000			$ 400,000,000
Maturity date				Jul. 31, 2016	Jul. 31, 2016	Jul. 31, 2012
Credit facility term (years)			5 years
Portion of credit facility designated for foreign currency tranche								40,000,000
Potential allowable increase in credit facility									100,000,000
Capitalized deferred finance costs			4,800,000
Unamortized fees and expenses							1,300,000
Threshold for line of credit facility borrowings										40,000,000
Threshold for line of credit facility percentage of asset based revolving credit facililties			10.00%
Equity interest pledged in foreign subsidiaries, percentage			65.00%
Line of credit facility commitment fee, percentage										0.375%	0.50%
Outstanding borrowings	1,114,600,000	1,048,900,000		86,300,000	34,900,000
Undrawn availability				280,600,000	336,000,000
Interest rate				2.20%	2.90%
Outstanding letters of credit	$ 57,500,000			$ 18,900,000	$ 20,200,000
Original issuance				Jul. 31, 2011	Jul. 31, 2011