Pension and Other Postretirement Plans (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 01, 2012	Dec. 03, 2011	Nov. 27, 2010
Fair Value Disclosures [Abstract]
Defined Benefit Plan Fair Value Of Plan Assets Before Reconciling Items	$ 146,166	$ 112,114
Defined Benefit Plan Fair Value Of Plan Assets Reconciling Items to Fair Value of Plan Assets	141	434
Defined Benefit Plan, Fair Value of Plan Assets	146,307	112,548
Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	146,166	7,407
Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	100,925
Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	3,782
U.S. equity securities funds [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	61,272	68,481
U.S. equity securities funds [Member] | Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	61,272	0
U.S. equity securities funds [Member] | Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	68,481
U.S. equity securities funds [Member] | Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Non-U.S. equity securities funds [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	27,422	12,613
Non-U.S. equity securities funds [Member] | Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	27,422	5,424
Non-U.S. equity securities funds [Member] | Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	7,189
Non-U.S. equity securities funds [Member] | Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed income securities funds [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	56,854	27,171
Fixed income securities funds [Member] | Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	56,854	1,916
Fixed income securities funds [Member] | Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	25,255
Fixed income securities funds [Member] | Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Real estate funds [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets		3,782
Real estate funds [Member] | Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets		0
Real estate funds [Member] | Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets		0
Real estate funds [Member] | Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	3,782	3,203
Cash and equivalents [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	618	67
Cash and equivalents [Member] | Level 1 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	618	67
Cash and equivalents [Member] | Level 2 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Cash and equivalents [Member] | Level 3 [Member]
Fair Value Disclosures [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0