Discontinued Operation (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended
	Jan. 08, 2014	Feb. 28, 2014	Jan. 08, 2014	Feb. 28, 2015	Nov. 30, 2014
Discontinued operation
Net annual rent receivable for each of the first five years	$ 500		$ 500
Present value	4,036		4,036
Accumulated depreciation				1,012	988
Pretax loss from the sale of assets
Consideration received		4,910
Carrying value of assets sold, principally inventory		(4,561)
Curtailment of employee benefit plan		309
Severance and other expenses		(710)
Pretax loss		(52)
Proceeds from sale of real estate assets	874	874
Note receivable	4,036		4,036
Imperial's landscape nursery business
Income statement disclosure
Sales revenue		11
Pre tax income (loss)		(400)
Pretax loss from the sale of assets
Severance and other expenses			563
Imperial's landscape nursery business | Inventory and certain assets
Discontinued operation
Non-interest bearing note receivable	4,250		4,250
Number of installments in which promissory note will become due			2
Amount of promissory note receivable due on June 1, 2014	2,750		2,750
Amount of promissory note receivable due on June 1, 2015	1,500		1,500
Period of non-competition restrictions			4 years
Proceeds from sale of nursery inventory			732
Discount rate (as a percent)			7.00%
Present value	4,036		4,036
Pretax loss from the sale of assets
Note receivable	4,036		4,036
Imperial's landscape nursery business | Connecticut production nursery
Discontinued operation
Lease period			10 years
Optional extension period of lease			15 years
Period during which purchase option is available			13 years
Price of land, land improvements and other operating assets under option to purchase	10,500		10,500
Price of a portion of land under option to purchase	$ 7,000		$ 7,000