Assets Held For Sale (Details) (USD $)	3 Months Ended		12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Aug. 31, 2012 Assets Held-For-Sale [Member]
Net book value of total assets held for sale	$ 39,000,000
Assets held for sale	33,559,000
Assets held for sale, non-current	5,000,000
Cash received at closing	30,000,000
Period in which remaining proceeds will be received	24 months
Gain (loss) on assets held-for-sale	This transaction did not result in a material gain or loss.
Lease revenues, net of sublease payments	1,486,000	1,288,000	4,800,000
Note prepayment exclusion amount	$ 5,000,000