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Commitments and Contingencies - Letters of Credit (Details) - USD ($) $ in Thousands | Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Standby letters of credit |  | $ 1,082 |
Financial Standby Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Standby letters of credit |  | $ 10,300 | $ 10,234
Subsequent Event | Financial Standby Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Standby letters of credit | $ 153 |  |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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