Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 13,242	$ 12,627
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	44,763,404	44,241,105
Treasury stock, shares	4,035,912	4,035,912