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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Contract Assets and Liabilities    
Contract assets $ 268,773 $ 349,559
Contract liabilities 75,546 46,170
Increase (decrease) in contract assets (80,800)  
Impairment losses related to contract assets 0 $ 0
Increase (decrease) in contract liabilities 29,400  
Revenue recognized included in contract liability $ 22,800