Fair Value Disclosures (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	$ 34,022	$ 11,570
Level 2 [Member]
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	75	0
Level 3 [Member]
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	$ 33,947	$ 11,570