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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Valuation allowance - deferred tax assets |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 3,810 | $ 3,291 | $ 5,952 |
Charged to costs and expenses |  | 670 | 529 | 521 |
Charged to Other Accounts |  | 0 | 0 | 0 |
Deductions |  | 108 | 10 | 3,182 |
Balance at end of period |  | 4,372 | 3,810 | 3,291 |
Valuation account - doubtful accounts |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | 968 | 785 | 341 |
Charged to costs and expenses |  | 2,534 | 635 | 729 |
Charged to Other Accounts |  | 0 | 0 | 40 | [1]
Deductions | [2] | (276) | 452 | 325 |
Balance at end of period |  | 3,778 | 968 | 785 |
Reserve for future credit returns and pricing adjustments |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | 2,677 | 2,560 | 2,169 |
Charged to costs and expenses |  | 17,816 | 12,640 | 10,715 |
Charged to Other Accounts |  | 0 | 0 | 0 |
Deductions |  | 19,017 | 12,523 | 10,324 |
Balance at end of period |  | $ 1,476 | $ 2,677 | $ 2,560 |
[1] | Established through purchase accounting relating to the acquisition of TempAlert
[2] | 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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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