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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

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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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