Discontinued Operation (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended			6 Months Ended		0 Months Ended
	May 31, 2014	Jan. 08, 2014	Nov. 30, 2013	May 31, 2014 Imperial's landscape nursery business	Nov. 30, 2013 Imperial's landscape nursery business	Mar. 02, 2013 Imperial's landscape nursery business	May 31, 2014 Imperial's landscape nursery business	Jun. 01, 2013 Imperial's landscape nursery business	Jan. 08, 2014 Imperial's landscape nursery business Inventory and certain assets item	Jun. 03, 2014 Imperial's landscape nursery business Inventory and certain assets Subsequent events	Jan. 08, 2014 Imperial's landscape nursery business Connecticut production nursery
Discontinued operation
Proceeds from sale of nursery inventory									$ 732
Non-interest bearing note receivable									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
Amount of promissory note receivable due on June 1, 2015									1,500
Discount rate (as a percent)									7.00%
Present value	4,036								4,036
Promissory Note installment received										2,750
Period of non-competition restrictions									4 years
Lease period											10 years
Optional extension period of lease											15 years
Net annual rent receivable for each of the first five years		500
Period during which purchase option is available											13 years
Price of land, land improvements and other operating assets under option to purchase											10,500
Price of a portion of land under option to purchase											7,000
Property and Equipment, gross	1,220		15,998								11,485
Accumulated depreciation	964		14,048								9,850
Revenue and the pretax loss
Net sales and other revenue				69		8,855	80	8,940
Pretax income (loss)				644		384	244	(205)
Reclassification of actuarial gains related to entity's postretirement benefits program				451			451
Inventory charge included in cost of landscape nursery sales					10,400
Pretax loss from the sale of assets
Consideration received from Monrovia	4,768
Carrying value of assets sold, principally inventory	(4,561)
Curtailment of employee benefit plan	309
Severance and other expenses	(563)
Pretax loss	(47)
Cash	169
Note receivable	4,036								4,036
Assets:
Accounts receivable	387		1,151
Inventories			4,116
Other	285		360
Assets	672		5,627
Liabilities:
Accounts payable and accrued liabilities	$ 94		$ 768