CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (PARENTHETICALS) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent	$ (153)	$ (4,076)	$ 533
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	348	(316)	(523)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ (89,697)	$ (39,281)	$ 24,754
Issuance of Class A shares, retirement units	0	18,038	3,385
Issuance of Class A shares, employee stock purchase plan	603,114	722,916	139,904
Issuance of Class A shares, stock options	100,200	257,600	118,400
Stock conversions, Class B shares to A shares	240	6,350	159
Restricted shares forfeited, Class A shares	0	0	2,585
Restricted stock units vested, Class A shares	210,769	203,566	57,520
Issuance of Class A shares, 401(k) company stock match	781,088	435,985	444,936
Repurchase of stock, Class A shares	0	0	52,412