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Valuation and Qualifying Accounts | 12 Months Ended
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Sep. 30, 2017
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 |  | Charged to Other Assets |  | (Deductions) and Additions |  | Balance at End of Period |
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 |
Year ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on accounts and financing receivables |  | 1,125 |  |  | 2,147 |  |  | — |  |  | (756 | ) |  | 2,516 |
| 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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve | $ | 9,674 |  | $ | 21,472 |  | $ | — |  | $ | (1,532 | ) | $ | 29,614 |
Year ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve |  | 6,675 |  |  | 10,590 |  |  | — |  |  | (7,591 | ) |  | 9,674 |
Year ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve |  | 7,764 |  |  | 3,887 |  |  | — |  |  | (4,976 | ) |  | 6,675 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + 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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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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