Pension and Postretirement Plans (Details 9) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 02, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 1,816,577	$ 1,651,958
Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	163,267	276,020
U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,249,079	1,090,693
International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	381,924	250,604
U S Federal agency mortgage- backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,071	1,699
Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	9,203	15,854
Other fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	10,652	15,444
Total investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,815,196	1,650,314
Receivables [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,381	1,644
Level 1 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	120,101	207,929
Level 1 [Member] | U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,249,079	1,090,693
Level 1 [Member] | International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	381,924	250,604
Level 1 [Member] | U S Federal agency mortgage- backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Other fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	2,531	7,106
Level 1 [Member] | Total investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,753,635	1,556,332
Level 2 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	43,166	68,091
Level 2 [Member] | U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | U S Federal agency mortgage- backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,071	1,699
Level 2 [Member] | Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	9,203	15,854
Level 2 [Member] | Other fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	8,121	8,338
Level 2 [Member] | Total investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 61,561	$ 93,982