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v3.19.3

Debt - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2019 CAD ($) period | Sep. 30, 2019 USD ($) period
Debt Instrument [Line Items] |  |  |  |  |
Interest expense | $ 2,957,000 | $ 1,000,000 | $ 2,162,000 |  |
Interest paid | $ 2,500,000 | $ 600,000 | $ 2,000,000.0 |  |
United States |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding borrowings |  |  |  |  | $ 3,200,000
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Leverage ratio | 2.50 |  |  |  |
Debt instrument, covenant, actual consolidated leverage ratio (less than) | 1.0 |  |  |  |
Credit Agreement | Swingline | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 5,000,000
Credit Agreement | Letters of credit | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 50,000,000
Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 400,000,000
Credit Agreement | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.125% |  |  |  |
Credit Agreement | Minimum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.00% |  |  |  |
Credit Agreement | Minimum | Eurocurrency Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |
Credit Agreement | Minimum | Index Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |
Credit Agreement | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.275% |  |  |  |
Credit Agreement | Maximum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.75% |  |  |  |
Credit Agreement | Maximum | Eurocurrency Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |
Credit Agreement | Maximum | Index Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |
Atlantic Innovation Fund of Canada |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings |  |  |  | $ 0.5 | $ 400,000
Interest expense | $ 0 |  |  |  |
Number of remaining quarterly installments | period |  |  |  | 11 | 11

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