Business Combinations - Schedule Of Assets Acquired And Liabilities (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 03, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Contingent Consideration, Liability	$ 8,068	$ 27,202		$ 27,202
GenePOC Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Contingent Consideration, Liability		$ 20,909	$ 27,202	$ 27,202
Licensing Agreements [Member] | GenePOC Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Technology-Based Intangible Assets [Member] | Exalenz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Technology-Based Intangible Assets [Member] | GenePOC Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Government Grants [Member] | GenePOC Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year 3 months 29 days
Noncompete Agreements [Member] | Exalenz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Trade Names [Member] | Exalenz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Customer Relationships [Member] | Exalenz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years