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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 38,587 $ 3,570
Accumulated Amortization 3,639 1,273
Net $ 34,948 $ 2,297
Completed technologies    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 6 years 4 months 24 days 6 years
Cost $ 20,341 $ 2,370
Accumulated Amortization 2,150 833
Net $ 18,191 $ 1,537
Customer relationships    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 4 years 9 months 18 days 6 years
Cost $ 17,628 $ 970
Accumulated Amortization 1,309 341
Net $ 16,319 $ 629
Trade names    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 4 years 6 months 5 years
Cost $ 618 $ 230
Accumulated Amortization 180 99
Net $ 438 $ 131