Restructuring (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 26, 2012
Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	$ 5.2
Costs incurred and charged to expense	1.5
Costs paid or otherwise settled	(2.4)
Changes in estimates	(0.3)
Balance at February 26, 2012	4.0
Network optimization plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	6.5
Costs incurred and charged to expense	1.5
Costs paid or otherwise settled	(2.2)
Changes in estimates	0.1
Balance at February 26, 2012	5.9
Severance and related costs [Member] | Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	5.1
Costs incurred and charged to expense	0.4
Costs paid or otherwise settled	(2.0)
Changes in estimates	(0.3)
Balance at February 26, 2012	3.2
Severance and related costs [Member] | Network optimization plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	5.9
Costs paid or otherwise settled	(0.5)
Changes in estimates	0.1
Balance at February 26, 2012	5.5
Plan implementation costs [Member] | Administrative efficiency restructuring plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	0.1
Costs incurred and charged to expense	1.1
Costs paid or otherwise settled	(0.4)
Balance at February 26, 2012	0.8
Plan implementation costs [Member] | Network optimization plan [Member]
Liabilities for various initiatives and changes
Balance at November 27, 2011	0.6
Costs incurred and charged to expense	1.5
Costs paid or otherwise settled	(1.7)
Balance at February 26, 2012	$ 0.4