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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 1,224 $ 1,392 $ 1,532
Amounts charged to expenses 588 (84) (170)
Deductions and adjustments 16 (84) 30
Balance at end of year 1,828 1,224 1,392
Warranty Reserves [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 209 246 324
Amounts charged to expenses 595 608 760
Adjustments to pre-existing warranty reserve 0 0 0
Settlement of warranty (561) (645) (838)
Balance at end of year 243 209 246
Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 3,079 2,912 2,288
Amounts charged to expenses 0 167 624
Deductions and adjustments (57) 0 0
Balance at end of year $ 3,022 $ 3,079 $ 2,912