Annual report pursuant to Section 13 and 15(d)

Balance Sheet Components Balance Sheet Components - Schedule of Components of Capitalized Computer Software (Details)

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Balance Sheet Components Balance Sheet Components - Schedule of Components of Capitalized Computer Software (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]      
Capitalized software $ 94,803 $ 88,627  
Less: Accumulated amortization (72,374) (61,879)  
Total Capitalized software, net 22,429 26,748  
Capitalized software amortization expense $ 11,200 $ 10,600 $ 9,200