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Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Increase (decrease) in fair value:        
Interest rate agreements $ (4,932) $ 0 $ (4,932) $ (25,966)
Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Interest rate agreements 482 1,053 2,588 1,969
Total other comprehensive income (loss) from hedging, net of tax $ (4,450) $ 1,053 $ (2,344) $ (23,997)