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Fair Value Measurements (Narratives) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Interest rate swap contracts      
Assets/Liabilities      
Notional principal amount of forward foreign exchange contracts $ 75,000,000.0   $ 75,000,000.0
Other Comprehensive Income (Loss) | Interest rate swap contracts      
Assets/Liabilities      
Unrealized gain on interest rate cash flow hedges 1,300,000   1,300,000
Not Designated as Hedging Instrument | Forward Foreign Currency Contracts      
Assets/Liabilities      
Notional principal amount of forward foreign exchange contracts $ 4,200,000   $ 9,600,000
Maximum maturities for contracts 40 days   40 days
Gain (losses) on foreign currency derivative instruments $ (500,000)   $ (200,000)
Not Designated as Hedging Instrument | Forward Foreign Currency Contracts      
Assets/Liabilities      
Notional principal amount of forward foreign exchange contracts $ 4,200,000 $ 22,600,000  
Maximum maturities for contracts 40 days    
Designated as Hedging Instrument | Forward Foreign Currency Contracts      
Assets/Liabilities      
Foreign exchange forward contract outstanding $ 0   0
Designated as Hedging Instrument | Forward Foreign Currency Contracts      
Assets/Liabilities      
Notional principal amount of forward foreign exchange contracts   $ 11,300,000  
Maximum maturities for contracts   12 months  
Unrealized gain on interest rate cash flow hedges   $ 400,000  
Level 2 Assets and Liabilities      
Assets/Liabilities      
Long-term debt, fair value 271,500,000   308,600,000
Transfers of assets between Level 1 and Level 2 0 0  
Transfers of liabilities between Level 1 and Level 2 0 0  
Level 3 Assets and Liabilities      
Assets/Liabilities      
Fair value, measurement level 3 asset, transfers 0   0
Fair value, measurement level 3 liabilities transfers 0   $ 0
Transfers of assets between Level 2 and Level 3 0 0  
Transfers of liabilities between Level 2 and Level 3 0 0  
Fair value assets impairment $ 0 $ 0