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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Deferred tax valuation allowance (deducted from net deferred tax assets)
      
Activity in valuation and qualifying accounts      
Balance at beginning of period $ 5,424 $ 4,558 $ 3,341
Charged to expense 1,792 866 1,217
Balance at end of period 7,216 5,424 4,558
Allowance for doubtful accounts (deducted from accounts receivable)
      
Activity in valuation and qualifying accounts      
Balance at beginning of period 891 1,248 514
Charged to expense 240 337 962
Reductions 89 694 228
Balance at end of period 1,042 891 1,248
Inventory allowance (deducted from inventory)
      
Activity in valuation and qualifying accounts      
Balance at beginning of period 1,452 2,574 990
Charged to expense 271 147 1,584
Reductions   1,269  
Balance at end of period $ 1,723 $ 1,452 $ 2,574