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Business Combinations - Summary of Purchase Price Allocation to the Fair Values Assigned to the Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]      
Goodwill $ 27,282 $ 26,555 $ 8,010
Developed Technology [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 11 years 8 months 12 days 11 years 9 months 18 days  
Creagh Medical Ltd [Member]      
Business Acquisition [Line Items]      
Current assets $ 896    
Property and equipment 634    
Other noncurrent assets 81    
Current liabilities (942)    
Deferred tax liabilities (9)    
Net assets acquired 14,583    
Goodwill 13,440    
Total purchase price, net of cash acquired $ 28,023    
Creagh Medical Ltd [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 1 year    
Creagh Medical Ltd [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 10 years    
Creagh Medical Ltd [Member] | Developed Technology [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 1,787    
Estimated Useful Life (In years) 7 years    
Creagh Medical Ltd [Member] | In-Process Research and Development [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 942    
Creagh Medical Ltd [Member] | Customer Relationship [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 11,119    
Creagh Medical Ltd [Member] | Customer Relationship [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 7 years    
Creagh Medical Ltd [Member] | Customer Relationship [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 10 years    
Creagh Medical Ltd [Member] | Trade Name [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 75    
NorMedix, Inc. [Member]      
Business Acquisition [Line Items]      
Current assets 113    
Property and equipment 60    
Deferred tax asset 690    
Other noncurrent assets 13    
Accounts payable (187)    
Deferred tax liabilities (2,483)    
Net assets acquired 5,956    
Goodwill 4,452    
Total purchase price, net of cash acquired $ 10,408    
Estimated Useful Life (In years) 7 years    
NorMedix, Inc. [Member] | Developed Technology [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 6,850    
NorMedix, Inc. [Member] | Developed Technology [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 10 years    
NorMedix, Inc. [Member] | Developed Technology [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Estimated Useful Life (In years) 14 years    
NorMedix, Inc. [Member] | Customer Relationship [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 900    
Estimated Useful Life (In years) 4 years