Retirement Benefit Plans (Weighted-Average Asset Allocations) (Details)	Dec. 31, 2011	Dec. 25, 2010
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	100.00%	100.00%
U.S. Pension Benefits [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	62.00%	64.00%
U.S. Pension Benefits [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	38.00%	36.00%
U.S. Pension Benefits [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.00%	0.00%
U.S. Pension Benefits [Member] | Cash and Money Market Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.00%	0.00%
U.S. Pension Benefits [Member] | Guaranteed Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.00%	0.00%
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	100.00%	100.00%
Foreign Pension Benefits [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	25.00%	30.00%
Foreign Pension Benefits [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	16.00%	13.00%
Foreign Pension Benefits [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	5.00%	1.00%
Foreign Pension Benefits [Member] | Cash and Money Market Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	41.00%	9.00%
Foreign Pension Benefits [Member] | Guaranteed Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	13.00%	47.00%