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Valuation and Qualifying Accounts | 12 Months Ended
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Sep. 30, 2018
Valuation And Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II Geospace Technologies Corporation and Subsidiaries Valuation and Qualifying Accounts (In thousands)
| Balance at Beginning of Period |  | Charged to Costs and Expenses, net of Recoveries |  | Charged to Other Assets |  | (Deductions) and Additions |  | Balance at End of Period |
Year ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on accounts and financing receivables | $ | 2,415 |  | $ | 1,009 |  | $ | — |  | $ | (122 | ) | $ | 3,302 |
Year ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on accounts and financing receivables | $ | 2,949 |  | $ | (380 | ) | $ | — |  | $ | (154 | ) | $ | 2,415 |
Year ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on accounts and financing receivables | $ | 2,516 |  | $ | 763 |  | $ | — |  | $ | (330 | ) | $ | 2,949 |
| Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Assets |  | (Deductions) and Additions |  | Balance at End of Period |
Year ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve | $ | 29,614 |  | $ | 4,353 |  | $ | — |  | $ | (3,416 | ) | $ | 30,551 |
Year ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve | $ | 9,674 |  | $ | 21,472 |  | $ | — |  | $ | (1,532 | ) | $ | 29,614 |
Year ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve | $ | 6,675 |  |  | 11,212 |  | $ | — |  | $ | (8,213 | ) | $ | 9,674 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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