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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Valuation Allowance - Deferred Tax Assets |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 5,914 |  | $ 862 | $ 572
Increase to costs and expenses |  | 136 |  | 5,260 | 316
Valuation Allowances and Reserves, Additions for Charges to Other Accounts |  | 0 |  | 0 | 0
Deductions |  | 98 |  | 208 | 26
Balance at end of period |  | 5,952 |  | 5,914 | 862
Valuation Account - Doubtful Accounts |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | 209 |  | 285 | 367
Increase to costs and expenses |  | 127 |  | 10 | 4
Valuation Allowances and Reserves, Additions for Charges to Other Accounts |  | 20 | [1] | 0 | 0
Deductions | [2] | 15 |  | 86 | 86
Balance at end of period |  | 341 |  | 209 | 285
Reserve for Future Returns and Pricing Adjustments |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of period |  | 1,991 |  | 1,817 | 1,662
Increase to costs and expenses |  | 10,447 |  | 9,946 | 7,002
Valuation Allowances and Reserves, Additions for Charges to Other Accounts |  | 0 |  | 0 | 0
Deductions |  | 10,269 |  | 9,772 | 6,847
Balance at end of period |  | $ 2,169 |  | $ 1,991 | $ 1,817
[1] | Established through purchase accounting relating to the acquisition of SMART Temps
[2] | Uncollectible accounts charged against allowance, net of recoveries

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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