Significant Accounting Policies - Summary of Disaggregation of Revenue by Reportable Segment and Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 51,480	$ 52,283
Revenue, % change	(2.00%)
Diagnostics [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 36,665	37,490
Revenue, % change	(2.00%)
Diagnostics [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 31,147	31,575
Revenue, % change	(1.00%)
Diagnostics [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 5,085	5,415
Revenue, % change	(6.00%)
Diagnostics [Member] | ROW [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 433	500
Revenue, % change	(13.00%)
Life Science [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 14,815	14,793
Life Science [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 4,534	5,250
Revenue, % change	(14.00%)
Life Science [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 7,455	5,185
Revenue, % change	44.00%
Life Science [Member] | ROW [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,826	$ 4,358
Revenue, % change	(35.00%)