Business Combinations - Summary of Purchase Price (Detail) $ in Thousands, € in Millions				12 Months Ended
	Jan. 08, 2016 USD ($)	Nov. 20, 2015 USD ($)	Nov. 20, 2015 EUR (€)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Business Acquisition [Line Items]
Contingent consideration				$ 14,900	$ 14,500
Creagh Medical Ltd [Member]
Business Acquisition [Line Items]
Cash Paid		$ 19,300	€ 18	18,449
Debt assumed				761
Contingent consideration				9,064
Total purchase price				28,274
Less cash and cash equivalents acquired				(251)
Total purchase price, net of cash acquired				28,023
NorMedix, Inc. [Member]
Business Acquisition [Line Items]
Cash Paid	$ 7,000			6,905
Contingent consideration				3,520
Total purchase price				10,425
Less cash and cash equivalents acquired				(17)
Total purchase price, net of cash acquired				$ 10,408