Annual report pursuant to Section 13 and 15(d)

Balance sheet components - Schedule of Components of Capitalized Computer Software (Details)

v3.19.3
Balance sheet components - Schedule of Components of Capitalized Computer Software (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]      
Capitalized software $ 103,643 $ 94,803  
Less: Accumulated amortization (71,274) (72,374)  
Total capitalized software, net 32,369 22,429  
Capitalized software amortization expense $ 7,200 $ 11,200 $ 10,600