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Debt - (Credit Facility and Subsequent Amendments - Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 CAD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 31, 2018 USD ($)
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available lines of credit | $ 839,632,000 |  |  | $ 693,444,000 |  |  |  |
Amended Credit Facility, due 2022 | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 150,000,000
Amended 2017 Term Loan | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 449,105,000 |  |
Change in face amount |  |  | $ (299,105,000) |  |  |  |  |
Amended 2017 Term Loan, Canadian Dollars | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 99,105,000 | $ 133,050,000 |
Amended 2017 Revolver | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 700,000,000 |  |
Second Amended Term Loan | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 130,000,000 |  |  |  |  |  |
Change in face amount |  | 150,000,000 |  |  |  |  |  |
Available lines of credit | 197,277,000 |  |  |  |  |  |  |
Second Amended Term Loan | Secured Debt | Redemption Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 2,630,000 |  |  |  |  |  |  |
Second Amended Term Loan | Secured Debt | Redemption Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 3,946,000 |  |  |  |  |  |  |
Second Amended Term Loan | Secured Debt | Redemption Period Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 5,261,000 |  |  |  |  |  |  |
Second Amended Term Loan | Secured Debt | Debt Instrument, Redemption, Period Four |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 157,821,000 |  |  |  |  |  |  |
Second Amended Term Loan, Canadian Dollars | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 84,229,000 |  |  | $ 106,440,000 |  |  |
Third Amended Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 4.50 |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 4.00 |  |  |  |  |  |  |
Third Amended Term Loan | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 4.00 |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 3.50 |  |  |  |  |  |  |
Third Amended Term Loan | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 4.25 |  |  |  |  |  |  |
Consideration transferred | $ 250,000,000 |  |  |  |  |  |  |
Debt instrument, covenant, leverage ratio | 4.25 |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | 300,000,000 |  |  |  |
Capitalized debt issuance costs |  |  |  | 1,161,000 |  |  |  |
Deferred asset |  |  |  | 1,096,000 |  |  |  |
Long-term debt |  |  |  | $ 300,000,000 |  |  |  |
Third Amended Term Loan | Secured Debt | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1000.00% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Secured Overnight Financing Rate | Net Leverage Ratio |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Federal Funds Effective Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Eurocurrency Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage | 0.175% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Minimum | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.375% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Minimum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.375% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage | 0.35% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Maximum | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Maximum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Redemption Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 3,750,000 |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Redemption Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 5,625,000 |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Redemption Period Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 7,500,000 |  |  |  |  |  |  |
Third Amended Term Loan | Secured Debt | Debt Instrument, Redemption, Period Four |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 232,500,000 |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of capital stock collateralizing debt | 65.00% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | Federal Funds Effective Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | Eurocurrency Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | CDOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | Minimum | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.125% |  |  |  |  |  |  |
Second Amended Credit Facility | Fourth Amended Credit Facility, due 2026 | Maximum | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |
Revolving Credit Facility | Amended Credit Facility, due 2022 | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 600,000,000
Revolving Credit Facility | Amended 2017 Revolver | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Change in borrowing capacity |  |  | $ 100,000,000 |  |  |  |  |
Revolving Credit Facility | Second Amended Revolver | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 850,000,000 |  |  |  |  |  |
Change in borrowing capacity |  | $ 150,000,000 |  |  |  |  |  |
Available lines of credit | $ 100,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Third Amended Term Loan | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available lines of credit | 288,750,000 |  |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended Credit Facility | Fourth Amended Credit Facility, due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Optional increase in line of credit maximum borrowing capacity | $ 350,000,000 |  |  |  |  |  |  |

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