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Debt (Additional Information) (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2024 | Jan. 26, 2024 | Jan. 25, 2024 | Nov. 22, 2022 | Sep. 22, 2022 | Apr. 11, 2022 | Mar. 11, 2022 | Aug. 12, 2021 | Mar. 01, 2021 | Jun. 30, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2024 | Jun. 24, 2024 | Apr. 26, 2024 | Jan. 31, 2024
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  | $ 9,873 | $ 0 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  |  |  | 658,283 |  |  |  | $ 658,283 |  |  |
Surety Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  |  |  |  |  |  |  |  |  | 58,300 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, increase (decrease) amount |  |  |  |  |  |  |  |  |  |  | (90,800) |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  | $ 227,300 |  |  |  |  |  |  |
Letters of credit expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 76,200
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |
Undrawn amount on letters of credit |  |  |  |  |  |  |  |  |  |  | $ 242,100 |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Revolving Credit Facility | Alternate Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |
Revolving Credit Facility | Alternate Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |
Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor rate |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Revolving Credit Facility | SOFR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |
Revolving Credit Facility | SOFR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |
Walden Title IV Letter Of Credit | Surety Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 69,400 | $ 84,000 |
Title IV Letter Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  | $ 157,900 |  |  |  |  |  |  |
Senior Secured Notes Due 2028 And Term B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Senior Secured Notes Due 2028 And Term B Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net leverage ratio |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |
Senior Secured Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  | $ 373,300 |  |  |  | $ 20,800 |  |  | $ 900 |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  |  |  | $ 404,950 |  |  |  | 404,950 |  |  |
Percentage of notes issued on par value |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  | 100.00% |  |  |  | 90.00% |  |  | 92.00% |  |  |  |  |
Senior Secured Notes Due 2028 | Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Accrued Interest |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  | 7,400 |  |  |
Senior Secured Notes Due 2028 | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  |  |  |  | 102.75% |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  |  |  |  | 101.375% |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Term B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 850,000 |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  | 7.60% |  |  |  |  |  |  |
Repayment of long-term debt |  | $ 50,000 |  | $ 50,000 | $ 100,000 |  | $ 396,700 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  |  |  | $ 253,333 |  |  |  | $ 253,333 |  |  |
Reduction in margin interest rate | (0.75%) | (0.50%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payment |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 2,125 |  |  |  |
Debt instrument, issuance price, percent of principal amount |  |  |  |  |  |  |  | 99.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, issuance discount, percent |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Term B Loan | Alternate Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Alternate Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  | 2.50% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Alternate Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  | 3.00% | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor rate | 0.75% | 0.75% | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | SOFR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  | 3.50% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | SOFR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  | 4.00% | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the ratio of consolidated total debt to consolidated adjusted earnings before, interest, taxes, depreciation and amortization allowed under the terms of the senior credit facilities' covenants. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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