Mortgage Loan (Details) $ in Thousands | Sep. 13, 2016USD ($) | Apr. 26, 2016USD ($)ft²building | Dec. 11, 2015USD ($)subsidiary | Sep. 01, 2015USD ($)ft²derivativesubsidiary | Jul. 29, 2015USD ($)ft²building | Dec. 31, 2014USD ($)ft²derivative | May 31, 2016USD ($) | Feb. 29, 2016USD ($) | Nov. 30, 2015USD ($)ft² | Aug. 31, 2016USD ($)item | Aug. 31, 2015USD ($) | Dec. 10, 2015USD ($) |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | $ 90,436 | $ 99,838 | | |
Debt disclosures | | | | | | | | | | | | |
Proceeds from issuance of debt | | | | | | | | | | 18,800 | $ 28,891 | |
Ineffectiveness on cash flow hedges | | | | | | | | | | 0 | | |
Anticipated ineffectiveness on cash flow hedges | | | | | | | | | | 0 | | |
Net fair values of interest rate swap agreements included in other liabilities | | | | | | | | | 2,766 | 4,639 | | |
Other liabilities caption | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Net fair values of interest rate swap agreements included in other liabilities | | | | | | | | | | 4,639 | | |
Nonrecourse variable rate loans, due October 2, 2017 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | 6,217 | 6,081 | | |
Nonrecourse variable rate loans, due February 1, 2019 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | 10,610 | 10,389 | | |
Nonrecourse variable rate loans, due August 1, 2019 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | $ 7,418 | | | | | | | 7,501 | | | |
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 | | | | | | | | | 3,729 | 3,637 | | |
Nonrecourse variable rate loans, due January 2, 2025 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | 19,385 | 20,869 | | |
Debt disclosures | | | | | | | | | | | | |
Proceeds from issuance of debt | | | | | | $ 10,891 | | | | | | |
Term of debt | | | | | | 10 years | | | | | | |
Amortization period of debt | | | | | | 25 years | | | | | | |
Number of subsidiaries which are party to the mortgage | subsidiary | | | 2 | | | | | | | | | |
Debt amount refinanced | | | | | | $ 8,859 | | | | | | |
Nonrecourse variable rate loans, due January 2, 2025 | Location 1 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Area of collateralized properties (in square feet) | ft² | | | | | | 303,000 | | | | | | |
Leased space | ft² | | | | | | 201,000 | | | | | | |
Nonrecourse variable rate loans, due January 2, 2025 | Location 2 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Area of collateralized properties (in square feet) | ft² | | | | | | 228,000 | | | | | | |
Nonrecourse variable rate mortgage, due September 1, 2025 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | 11,457 | 13,809 | | |
Debt disclosures | | | | | | | | | | | | |
Area of collateralized properties (in square feet) | ft² | | | | 280,000 | | | | | | | | |
Term of debt | | | | 10 years | | | | | | | | |
Amortization period of debt | | | | 25 years | | | | | | | | |
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] | Subsequent events | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Term of debt | 10 years | | | | | | | | | | | |
Amortization period of debt | 25 years | | | | | | | | | | | |
Loan amount increase | $ 13,000 | | | | | | | | | | | |
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member] | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | | 14,269 | | |
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 1 May 2026 [Member] | Location 1 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Leased space | ft² | | 58,000 | | | | | | | | | | |
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member] | Location 2 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Leased space | ft² | | 40,000 | | | | | | | | | | |
5.09%, due July 1, 2029 GCD mortgage loan | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | $ 7,385 | $ 7,099 | | |
Interest rate (as a percent) | | | | | | | | | 5.09% | 5.09% | | |
5.09%, due July 1, 2029 TD mortgage Loan | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | $ 6,226 | $ 5,984 | | |
Interest rate (as a percent) | | | | | | | | | 5.09% | 5.09% | | |
4.33%, due August 1, 2030 mortgage loan | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | | | | | $ 17,926 | $ 17,701 | | |
Interest rate (as a percent) | | | | | | | | | 4.33% | 4.33% | | |
Debt disclosures | | | | | | | | | | | | |
New mortgage | | | | | $ 18,000 | | | | | | | |
Number of buildings used as collateral | building | | | | | 3 | | | | | | | |
Proceeds from issuance of debt | | | | | $ 14,875 | | | | | | | |
Term of debt | | | | | 15 years | | | | | | | |
Amortization period of debt | | | | | 30 years | | | | | | | |
Nonrecourse mortgages: 5.73%, due August 1, 2015 | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | | | |
Mortgage loans | | | | | $ 17,891 | | | | | | | |
Interest rate (as a percent) | | | | | 5.73% | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Number of buildings used as collateral | building | | | | | 3 | | | | | | | |
Area of collateralized properties (in square feet) | ft² | | | | | 392,000 | | | | | | | |
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 | | | | | | | | | | $ 2,898 | $ 812 | |
Loss expected to be reclassified over next twelve months from accumulated other comprehensive loss to interest expense | | | | | | | | | | $ 1,199 | | |
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 | | | | | | 3 | | | | | | |
Interest rate swap agreement | Nonrecourse variable rate mortgage, due September 1, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Fixed interest rate pursuant to interest rate swap agreement (as a percent) | | | | 3.75% | | | | | | | | |
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% | | | | | | | | | | |
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] | 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) | | | | | | 4.43% | | | | | | |
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] | Interest rate swap agreement | Nonrecourse variable rate mortgage, due September 1, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Fixed interest rate pursuant to interest rate swap agreement (as a percent) | | | | 3.77% | | | | | | | | |
Notional amount of interest rate swap agreement | | | | $ 11,500 | | | | | | | | |
Nonrecourse Mortgage, Contingent Portion [Member] | Nonrecourse variable rate loans, due January 2, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Proceeds held in escrow | | | $ 1,850 | | | | | | | | | |
Nonrecourse Mortgage, Contingent Portion [Member] | Nonrecourse variable rate loans, due January 2, 2025 | Location 1 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Leased space | ft² | | | | | | 102,000 | | | | | | |
Nonrecourse Mortgage, Contingent Portion [Member] | Nonrecourse variable rate mortgage, due September 1, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Proceeds held in escrow | | | | | | | | | | | | $ 2,600 |
Nonrecourse Mortgage, Contingent Portion [Member] | 4.33%, due August 1, 2030 mortgage loan | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Proceeds from issuance of debt | | | | | $ 25 | | $ 600 | $ 25 | $ 2,500 | | | |
Leased space | ft² | | | | | | | | | 88,000 | | | |
Proceeds held in escrow | | | | | $ 3,125 | | | | | | | |
Nonrecourse Mortgage, Contingent Portion [Member] | 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) | | | | | | 3.88% | | | | | | |
Notional amount of interest rate swap agreement | | | | | | $ 1,850 | | | | | | |
Nonrecourse Mortgage, Contingent Portion [Member] | Interest rate swap agreement | Nonrecourse variable rate mortgage, due September 1, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Fixed interest rate pursuant to interest rate swap agreement (as a percent) | | | | 3.67% | | | | | | | | |
Notional amount of interest rate swap agreement | | | | $ 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, due September 1, 2025 | | | | | | | | | | | | |
Debt disclosures | | | | | | | | | | | | |
Variable interest rate margin (as a percent) | | | | 1.65% | | | | | | | | |
LIBOR | Nonrecourse Variable Rate Mortgage, Refinanced, Due In September 2026 [Member] | Subsequent events | | | | | | | | | | | | |
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% | | | | | | | | | | |