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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
6 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Business Acquisition [Line Items]    
Goodwill $ 26,965 $ 8,010
Developed Technology [Member]    
Business Acquisition [Line Items]    
Estimated Useful Life (In years) 11 years 9 months 18 days  
Creagh Medical Ltd [Member]    
Business Acquisition [Line Items]    
Current assets $ 708  
Property and equipment 634  
Other noncurrent assets 81  
Current liabilities (923)  
Deferred tax liabilities (9)  
Net assets acquired 14,414  
Goodwill 13,609  
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 98  
Property and equipment 76  
Deferred tax asset 746  
Other noncurrent assets 12  
Deferred tax liabilities (2,474)  
Net assets acquired 6,208  
Goodwill 4,515  
Total purchase price, net of cash acquired 10,723  
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