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Business Combinations - Pro Forma Financial Information (Detail) - Creagh Medical and NorMedix [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]    
Revenue $ 72,416 $ 65,432
Net income $ 12,315 $ 6,583
Per share amounts:    
Basic net income per share $ 0.95 $ 0.51
Diluted net income per share $ 0.93 $ 0.50