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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Valuation Allowance - Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 572 $ 807 $ 887
Increase (Decrease) to costs and expenses 316 174 170
Deductions 26 409 250
Balance at end of period 862 572 807
Valuation Account - Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 367 313 295
Increase (Decrease) to costs and expenses 202 209 309
Deductions [1] 86 155 291
Balance at end of period 483 367 313
Reserve for Future Returns and Pricing Adjustments      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,662 1,770 1,362
Increase (Decrease) to costs and expenses 7,002 6,526 6,973
Deductions 6,847 6,634 6,565
Balance at end of period $ 1,817 $ 1,662 $ 1,770
[1] Uncollectible accounts charged against allowance, net of recoveries