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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Valuation allowance - deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 3,291 $ 5,952 $ 5,914
Charged to costs and expenses 529 521 136
Charged to Other Accounts 0 0 0
Deductions 10 3,182 98
Balance at end of period 3,810 3,291 5,952
Valuation account - doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 785 [1] 341 [1] 209
Charged to costs and expenses 635 [1] 729 [1] 127
Charged to Other Accounts 0 [1] 40 [1],[2] 20 [3]
Deductions [4] 452 [1] 325 [1] 15
Balance at end of period [1] 968 785 341
Reserve for future returns and pricing adjustments      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 2,560 2,169 1,991
Charged to costs and expenses 12,640 10,715 10,447
Charged to Other Accounts 0 0 0
Deductions 12,523 10,324 10,269
Balance at end of period $ 2,677 $ 2,560 $ 2,169
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.
[2] Established through purchase accounting relating to the acquisition of TempAlert
[3] Established through purchase accounting relating to the acquisition of SMART Temps®
[4] Uncollectible accounts charged against allowance, net of recoveries