Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 25, 2010	Dec. 26, 2009
Significant Accounting Policies [Line Items]
Other intangible assets, estimated useful life (in years), minimum	5
Other intangible assets, estimated useful life (in years), maximum	10
Stock options excluded from calculation of diluted earnings per share, antidilutive	220,244	1,349,313	1,895,742
Commercial Trucking Claims [Member]
Significant Accounting Policies [Line Items]
Company retained liability per claim	5,000,000
General Liability Claim [Member]
Significant Accounting Policies [Line Items]
Company retained liability per claim	1,000,000
Workers' Compensation Claim [Member]
Significant Accounting Policies [Line Items]
Company retained liability per claim	250,000
Cargo Claim [Member]
Significant Accounting Policies [Line Items]
Company retained liability per claim	250,000
Buildings And Improvements [Member]
Significant Accounting Policies [Line Items]
Depreciated life (in years)	30
Trailing Equipment [Member]
Significant Accounting Policies [Line Items]
Depreciated life (in years)	7
Hardware And Software [Member]
Significant Accounting Policies [Line Items]
Depreciated life (in years), minimum	3
Depreciated life (in years), maximum	7