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Mortgage Loan (Details) $ in Thousands								6 Months Ended
Mortgage Loan (Details) $ in Thousands	Apr. 26, 2017 USD ($) ft² building	Mar. 15, 2017 USD ($) building	Nov. 17, 2016 USD ($) ft² derivative	Dec. 11, 2015 USD ($) ft² derivative subsidiary	Dec. 10, 2015 USD ($) subsidiary	Sep. 01, 2015 USD ($) ft²	Dec. 31, 2014 USD ($) ft²	May 31, 2017 USD ($) ft² item	May 31, 2016 USD ($)	Nov. 30, 2016 USD ($)
Long-Term Debt
Mortgage loans, prior to debt issuance costs								$ 121,535		$ 111,139
Debt issuance costs, net								(1,565)		(1,442)
Mortgage loans, net								119,970		109,697
Debt disclosures
Other assets								16,362		15,163
Proceeds from issuance of debt								12,000	$ 18,800
Funds placed in (returned from) escrow									(600)
Ineffectiveness on cash flow hedges								0
Anticipated ineffectiveness on cash flow hedges								0
Net fair value of interest rate swap agreements								1,969
Other assets
Debt disclosures
Net fair value of interest rate swap agreements								129
Other liabilities caption
Debt disclosures
Net fair value of interest rate swap agreements								2,098
Accounting Standards Update 2015-03 [Member] \| Restatement Adjustment [Member]
Long-Term Debt
Mortgage loans, net										(1,442)
Debt disclosures
Other assets										(1,442)
Nonrecourse variable rate loans, due October 2, 2017
Long-Term Debt
Mortgage loans, prior to debt issuance costs								5,940		6,034
Nonrecourse variable rate loans, due February 1, 2019
Long-Term Debt
Mortgage loans, prior to debt issuance costs								10,158		10,313
Nonrecourse variable rate loans, due August 1, 2019
Long-Term Debt
Mortgage loans, prior to debt issuance costs	$ 7,418
Debt disclosures
Number of buildings used as collateral \| building	4
Area of collateralized properties (in square feet) \| ft²	240,000
Nonrecourse variable rate loans, due January 27, 2020
Long-Term Debt
Mortgage loans, prior to debt issuance costs								3,543		3,606
Nonrecourse variable rate loans, due January 2, 2025
Long-Term Debt
Mortgage loans, prior to debt issuance costs								20,485		20,744
Debt disclosures
Proceeds from issuance of debt							$ 10,891
Term of debt				10 years
Number of subsidiaries which are party to the mortgage \| subsidiary				2
Debt amount refinanced							$ 8,859
Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Leased space \| ft²						196,000
Number of subsidiaries which are party to the mortgage \| subsidiary					1
Nonrecourse Variable Rate Mortgage, Refinanced, Due In September 2026 [Member]
Long-Term Debt
Mortgage loans, prior to debt issuance costs			$ 26,725
Debt disclosures
Proceeds from issuance of debt			$ 13,000
Term of debt			10 years
Debt amount refinanced			$ 13,725
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Long-Term Debt
Mortgage loans, prior to debt issuance costs								14,015		14,187
Debt disclosures
New mortgage	$ 14,350
Number of buildings used as collateral \| building	4
Proceeds from issuance of debt	$ 6,932
Term of debt	10 years
Amortization period of debt	25 years
Additional area serving as collateral \| ft²	98,000
Nonrecourse Variable Rate Mortgage Due On November 17, 2026 [Member]
Long-Term Debt
Mortgage loans, prior to debt issuance costs								26,404		26,725
5.09%, due July 1, 2029 GCD mortgage loan
Long-Term Debt
Mortgage loans, prior to debt issuance costs								$ 6,801		7,001
Interest rate (as a percent)								5.09%
5.09%, due July 1, 2029 TD mortgage Loan
Long-Term Debt
Mortgage loans, prior to debt issuance costs								$ 4,765		4,905
Interest rate (as a percent)								5.09%
4.33%, due August 1, 2030 mortgage loan
Long-Term Debt
Mortgage loans, prior to debt issuance costs								$ 17,468		$ 17,624
Interest rate (as a percent)								4.33%
2017 PUB Mortgage
Debt disclosures
New mortgage		$ 12,000
Number of buildings used as collateral \| building		2
Term of debt		10 years
Amortization period of debt		25 years
Number of buildings subject to master lease \| building		1
First Collateralized Property \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Area of collateralized properties (in square feet) \| ft²								303,000
First Collateralized Property \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Area of collateralized properties (in square feet) \| ft²								280,000
First Collateralized Property \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Leased space \| ft²	58,000
Second Collateralized Property \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Area of collateralized properties (in square feet) \| ft²								228,000
Leased space \| ft²							201,000
Second Collateralized Property \| Nonrecourse Variable Rate Mortgage, Refinanced, Due In September 2026 [Member]
Debt disclosures
Area of collateralized properties (in square feet) \| ft²			252,000
Second Collateralized Property \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Leased space \| ft²	40,000
Interest rate swap agreement
Debt disclosures
Number of agreements containing credit risk related contingent features \| item								0
Recognized net losses (included in other comprehensive loss), before taxes, on interest rate swap agreements								$ 284	$ 1,092
Loss expected to be reclassified over next twelve months from accumulated other comprehensive loss to interest expense								$ 1,041
Interest rate swap agreement \| Nonrecourse variable rate loans, due August 1, 2019
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)	6.58%
Interest rate swap agreement \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)				4.39%
Number of interest rate swap derivatives \| derivative				2
Interest rate swap agreement \| Nonrecourse Variable Rate Mortgage, Refinanced, Due In September 2026 [Member]
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)			3.79%
Number of interest rate swap derivatives \| derivative			2
Interest rate swap agreement \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)	4.17%
Interest rate swap agreement \| 2017 PUB Mortgage
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)		4.45%
Notional amount of interest rate swap agreement		$ 12,000
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Proceeds from issuance of debt						$ 11,500
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] \| Second Collateralized Property \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Leased space \| ft²				102,000
Nonrecourse Mortgage, Contingent Portion [Member] \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Proceeds from issuance of debt				$ 1,850
Nonrecourse Mortgage, Contingent Portion [Member] \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Proceeds from issuance of debt					$ 2,600
LIBOR \| Nonrecourse variable rate loans, due August 1, 2019
Debt disclosures
Variable interest rate margin (as a percent)	3.08%
LIBOR \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Variable interest rate margin (as a percent)								1.95%
LIBOR \| Nonrecourse Variable Rate Mortgage, Refinanced, Due In September 2026 [Member]
Debt disclosures
Variable interest rate margin (as a percent)								1.70%
LIBOR \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Variable interest rate margin (as a percent)	2.00%
LIBOR \| 2017 PUB Mortgage
Debt disclosures
Variable interest rate margin (as a percent)		1.95%