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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Valuation Allowance - Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 807 $ 887 $ 561
Increase (Decrease) to costs and expenses 174 170 465
Deductions 409 250 139
Balance at end of period 572 807 887
Valuation Account - Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 313 295 339
Increase (Decrease) to costs and expenses 209 309 418
Deductions 155 [1] 291 [1] 462 [1]
Balance at end of period 367 313 295
Reserve for Future Returns and Pricing Adjustments
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,770 1,362 1,280
Increase (Decrease) to costs and expenses 6,526 6,973 4,881
Deductions 6,634 6,565 4,799
Balance at end of period $ 1,662 $ 1,770 $ 1,362
[1] Uncollectible accounts charged against allowance, net of recoveries