(5) Debt (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Jan. 01, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,394,278	$ 1,356,999
Amounts payable within one year	(9,905)	(6,597)
Long-term debt	1,384,373	1,350,402
Unsecured Debt [Member] | Senior Notes
Debt Instrument [Line Items]
Long-term debt	433,598	554,901
Unsecured Debt [Member] | 6.20% senior notes
Debt Instrument [Line Items]
Long-term debt	225,600	224,643
Unsecured Debt [Member] | 7% debentures
Debt Instrument [Line Items]
Long-term debt	1,462	1,466
Unsecured Debt [Member] | Debt Instrument 7 [Member]
Debt Instrument [Line Items]
Long-term debt	0	11,303
Capital Lease Obligations [Member] | Debt Instrument 5 [Member]
Debt Instrument [Line Items]
Long-term debt	30,303	15,222
Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	619,691	0
Secured Debt [Member] | Debt Instrument 2 [Member]
Debt Instrument [Line Items]
Long-term debt	0	466,062
Secured Debt [Member] | Sale-leaseback obligations
Debt Instrument [Line Items]
Long-term debt	82,917	82,342
Secured Debt [Member] | 6.54% aircraft term loan
Debt Instrument [Line Items]
Long-term debt	$ 707	$ 1,060