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Financial Instruments: Derivatives and Hedging (Details) - USD ($)
$ in Thousands
Nov. 30, 2021
Jun. 30, 2020
Financial Instruments: Derivatives and Hedging    
Hedged amount of portion of the future LIBOR-based rate risk   $ 23,000
Amount estimated to be reclassified into earnings within next 12 months   10,900
JPM Term Loan    
Financial Instruments: Derivatives and Hedging    
Hedged amount of portion of the future LIBOR-based rate risk   100,000
2017 Interest Rate Swap | Cash flow hedges    
Financial Instruments: Derivatives and Hedging    
Notional Value   $ 400,000
Strike Rate (as a percent)   1.12%
Fair Value   $ (4,880)
2013 BMO Interest Rate Swap | Cash flow hedges    
Financial Instruments: Derivatives and Hedging    
Notional Value   $ 220,000
Strike Rate (as a percent)   2.32%
Fair Value   $ (734)
2019 JPM Interest Rate Swap | Cash flow hedges    
Financial Instruments: Derivatives and Hedging    
Notional Value   $ 100,000
Strike Rate (as a percent)   2.44%
Fair Value   $ (3,241)
2019 BMO Interest Rate Swap | Cash flow hedges    
Financial Instruments: Derivatives and Hedging    
Notional Value   $ 220,000
Strike Rate (as a percent)   2.39%
Fair Value   $ (14,103)
2019 BMO Interest Rate Swap | Cash flow hedges | Forecast    
Financial Instruments: Derivatives and Hedging    
Notional Value $ 165,000