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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Adoption of recently issued accounting standards      
Deferred income taxes $ 68,059 $ 92,852  
Increase (decrease) in cash flows from operating activities 120,303 81,708 $ 65,043
Increase (decrease) in cash flows from financing activities 183,784 (52,787) $ 138,667
New Accounting Pronouncement, Early Adoption Effect | Accounting Standards Update 2015-17      
Adoption of recently issued accounting standards      
Current and Deferred Income Tax Assets   (23,400)  
Deferred income taxes   23,400  
New Accounting Pronouncement, Early Adoption Effect | Accounting Standards Update 2016-15      
Adoption of recently issued accounting standards      
Increase (decrease) in cash flows from operating activities 5,400 18,300  
Increase (decrease) in cash flows from financing activities $ (5,400) $ (18,300)