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Debt - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) period letter_of_credit | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 CAD ($) period letter_of_credit
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 1,000,000 | $ 2,162,000 | $ 4,134,000 |
Credit Agreement Expiring January 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |  |
Leverage ratio | 2.5 |  |  |
Debt instrument, covenant consolidated leverage ratio actual | 1 |  |  |
Interest paid | $ 600,000 | $ 2,000,000 | $ 3,700,000 |
Credit Agreement Expiring January 2020 | Minimum | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 0.00% |  |  |
Credit Agreement Expiring January 2020 | Minimum | Eurocurrency Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 1.00% |  |  |
Credit Agreement Expiring January 2020 | Minimum | Index Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 1.00% |  |  |
Credit Agreement Expiring January 2020 | Maximum | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 0.75% |  |  |
Credit Agreement Expiring January 2020 | Maximum | Eurocurrency Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 1.75% |  |  |
Credit Agreement Expiring January 2020 | Maximum | Index Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin (as a percent) | 1.75% |  |  |
Swingline loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 5,000,000 |  |  |
Letters of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 50,000,000 |  |  |
Number of letters of credit issued | letter_of_credit | 2 |  |  | 2
Outstanding borrowings | $ 700,000 |  |  |
Letters of credit | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage ratio to calculate annual commitment fee (as a percent) | 0.125% |  |  |
Letters of credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage ratio to calculate annual commitment fee (as a percent) | 0.275% |  |  |
Atlantic Innovation Fund of Canada |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings | $ 500,000 |  |  | $ 0.7
Interest expense | $ 0 |  |  |
Number of remaining quarterly installments | period | 15 |  |  | 15
Letters of credit (Other than Revolving Credit Agreement) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of letters of credit issued | letter_of_credit | 2 |  |  | 2
Outstanding borrowings | $ 3,000,000 |  |  |

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- Definition The total leverage ratio under the terms of the credit facility covenants. If the entity exceeds this ratio, the credit agreement will become secured by the assets of the entity and certain of the entity's subsidiaries. + References No definition available. + Details
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- Definition Represents the percentage used to calculate the unused capacity commitment fee which is based on the total leverage ratio under the terms of the credit facility covenants. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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