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Summary of Significant Accounting Policies (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Inventory Write-down $ 602  
Research and Development Expense (in Dollars) $ 2,984 $ 2,826
Number of Years Defined Benefit Plans are Closed to Newly Hired Employees 2 years  
Number of Years Supplementary Retirement Plans are Closed to Newly Hired Employees 2 years  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) 25 26
Stock-based compensation expense on stock options and restricted stock awards $ 414 $ 375
Minimum    
Finite-Lived Intangible Asset, Useful Life 3 years  
Property, Plant and Equipment, Useful Life 3 years  
Hardware Warranty Included in Product Sales 90 days  
Maximum    
Finite-Lived Intangible Asset, Useful Life 10 years  
Property, Plant and Equipment, Useful Life 7 years  
Hardware Warranty Included in Product Sales 3 years