Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Current Assets
Cash and cash equivalents	$ 180,302	$ 74,284
Short-term investments	34,939	35,528
Trade accounts receivable, less allowance of $3,773 and $8,650	378,732	408,787
Other receivables, including advances to independent contractors, less allowance of $4,253 and $4,657	73,903	55,278
Deferred income taxes and other current assets	14,592	18,067
Total current assets	682,468	591,944
Operating property, less accumulated depreciation and amortization of $157,985 and $158,999	177,329	158,953
Goodwill	31,134	57,470
Other assets	79,765	71,054
Total assets	970,696	879,421
Current Liabilities
Cash overdraft	27,780	33,647
Accounts payable	157,796	188,981
Current maturities of long-term debt	27,567	19,016
Insurance claims	92,280	64,509
Other current liabilities	70,237	38,186
Total current liabilities	375,660	344,339
Long-term debt, excluding current maturities	73,938	95,125
Insurance claims	24,171	21,896
Deferred income taxes and other noncurrent liabilities	42,446	38,607
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,017,858 and 66,859,864 shares	670	669
Additional paid-in capital	179,807	173,976
Retained earnings	1,173,044	1,042,956
Cost of 21,528,693 and 20,411,736 shares of common stock in treasury	(899,028)	(839,517)
Accumulated other comprehensive income (loss)	(12)	1,370
Total shareholders' equity	454,481	379,454
Total liabilities and shareholders' equity	$ 970,696	$ 879,421