Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		12 Months Ended
	Oct. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Oct. 01, 2019	Jun. 30, 2019	Sep. 30, 2016
Schedule Of Accounting Policies [Line Items]
Indefinite-Lived intangible assets other than goodwill		$ 0
Goodwill impairment charge				$ 6,628,000
Intangible Assets Impairments		0
Changes in Goodwill		34,604,000
Amortization of intangible assets		4,531,000	$ 3,433,000	3,776,000
2020		6,684,000
2021		5,490,000
2022		5,113,000
2023		5,100,000
2024		$ 5,096,000
Expected instrument utilization period		3 years
Likelihood percentage of tax benefit being recognized upon ultimate settlement		50.00%
Revenue, description of payment terms		30 to 90 days from the date of shipment or satisfaction of the performance obligation
Contingent consideration liability		$ 27,200,000				$ 27,200,000
Noncash Capital Expenditures		108,000	294,000	394,000
Accounting Standards Update 2014-09 [Member]
Schedule Of Accounting Policies [Line Items]
Income tax effects of the Tax Cuts and Jobs Act from AOCI to retained earnings		(116,000)
Reduction to opening balance of retained earnings	$ (116,000)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Schedule Of Accounting Policies [Line Items]
Income tax effects of the Tax Cuts and Jobs Act from AOCI to retained earnings		(116,000)
Adjustments for New Accounting Pronouncement [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Schedule Of Accounting Policies [Line Items]
Income tax effects of the Tax Cuts and Jobs Act from AOCI to retained earnings		148,000
Adjustments for New Accounting Pronouncement [Member] | Retained Earnings [Member]
Schedule Of Accounting Policies [Line Items]
Income tax effects of the Tax Cuts and Jobs Act from AOCI to retained earnings		$ (148,000)
ASU 2016-02 [Member] | Subsequent Event [Member]
Schedule Of Accounting Policies [Line Items]
Lease Right Of Use Assets					$ 6,000,000
Lease Liabilities					$ 6,000,000
Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Contract cost, amortization period		1 year
Maximum [Member] | Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment		$ 50,000,000
Maximum [Member] | Reagent Rental Arrangements [Member] | Lease Elements [Member] | Product Concentration Risk [Member] | Revenues [Member]
Schedule Of Accounting Policies [Line Items]
Concentration Risk, Percentage		2.00%
Currency Translation Adjustment [Member]
Schedule Of Accounting Policies [Line Items]
Changes in Goodwill			(289,000)
Goodwill Period Increase		$ 599,000
Goodwill Period Decrease		(577,000)
GenePOC
Schedule Of Accounting Policies [Line Items]
Goodwill acquired		34,582,000
Amortization of intangible assets		1,204,000
Contingent consideration liability		27,200,000
GenePOC | Maximum [Member] | Product Development Milestones [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment		20,000,000
GenePOC | Maximum [Member] | Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment		50,000,000
GenePOC | Maximum [Member] | Product Development Milestones And Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment		$ 70,000,000
Buildings and Improvements [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		18 years
Buildings and Improvements [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		40 years
Machinery, Equipment and Furniture [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		3 years
Machinery, Equipment and Furniture [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		10 years
Computer Equipment and Software [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		3 years
Computer Equipment and Software [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		5 years
Instruments Under Customer Reagent Rental Arrangements [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life		5 years
Leasehold Improvements [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives		life of the lease
Inventory Realizability Reserves [Member]
Schedule Of Accounting Policies [Line Items]
Inventory Valuation Reserves		$ 2,285,000	$ 1,971,000	$ 2,059,000			$ 2,680,000