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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Valuation allowance - deferred tax assets |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | $ 5,952 |  | $ 5,914 |  | $ 862
Charged to costs and expenses |  | 521 |  | 136 |  | 5,260
Charged to Other Accounts |  | 0 |  | 0 |  | 0
Deductions |  | 3,182 |  | 98 |  | 208
Balance at end of period |  | 3,291 |  | 5,952 |  | 5,914
Valuation account - doubtful accounts |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | 341 |  | 209 |  | 285
Charged to costs and expenses |  | 729 |  | 127 |  | 10
Charged to Other Accounts |  | 40 | [1] | 20 | [2] | 0
Deductions | [3] | 37 |  | 15 |  | 86
Balance at end of period |  | 1,073 |  | 341 |  | 209
Reserve for future returns and pricing adjustments |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | 2,169 |  | 1,991 |  | 1,817
Charged to costs and expenses |  | 10,715 |  | 10,447 |  | 9,946
Charged to Other Accounts |  | 0 |  | 0 |  | 0
Deductions |  | 10,324 |  | 10,269 |  | 9,772
Balance at end of period |  | $ 2,560 |  | $ 2,169 |  | $ 1,991
[1] | Established through purchase accounting relating to the acquisition of TempAlert
[2] | Established through purchase accounting relating to the acquisition of SMART Temps®
[3] | Uncollectible accounts charged against allowance, net of recoveries

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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