Property and Equipment Net - Components of Property and Equipment,Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Line Items]
Finance leases	$ 2,710
Subtotal	72,912	$ 55,327
Less: accumulated depreciation	(43,383)	(35,214)
Total	29,529	20,113
Machinery and equipment
Property Plant And Equipment [Line Items]
Subtotal	$ 7,746	8,424
Machinery and equipment | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	3 years
Machinery and equipment | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	5 years
Computers, software and equipment
Property Plant And Equipment [Line Items]
Subtotal	$ 42,705	32,894
Computers, software and equipment | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	3 years
Computers, software and equipment | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	5 years
Leasehold improvements
Property Plant And Equipment [Line Items]
Subtotal	$ 10,513	9,147
Leasehold improvements | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	2 years
Leasehold improvements | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	15 years
Furniture and fixtures
Property Plant And Equipment [Line Items]
Subtotal	$ 4,691	3,819
Furniture and fixtures | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	5 years
Furniture and fixtures | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment Useful Life	7 years
Construction in progress
Property Plant And Equipment [Line Items]
Subtotal	$ 4,547	$ 1,043