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Debt - Narrative (Details) |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Nov. 15, 2019 USD ($) | Sep. 24, 2019 USD ($) | Mar. 21, 2019 USD ($) | Sep. 20, 2016 USD ($) | May 20, 2015 USD ($) | Dec. 04, 2014 USD ($) | Dec. 17, 2012 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 29, 2020 USD ($) | Nov. 15, 2017 | Sep. 20, 2016 EUR (€) | Feb. 28, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from extinguishment of debt |  |  |  |  |  |  |  |  | $ 76,200,000 | $ 0 | $ 0 |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 2,352,300,000 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 77,000,000.0 |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | $ 600,000,000.0 |  |  |  |  |  |  |  |  |  |  | $ 890,000,000.0 |  |  |
Debt issuance costs | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate borrowing availability |  |  |  |  |  |  |  |  | 579,300,000 |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  | $ 20,700,000 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |
5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |
Aggregate borrowing amount |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Capitalized debt issuance costs |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |
4.00% Notes, due October 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.00% | 4.00% |  |  |  | 4.00% |
Aggregate borrowing amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 425,000,000 |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Capitalized debt issuance costs |  |  |  |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |
5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.75% |  |  | 5.75% | 5.80% |  |  |  |  |
Aggregate borrowing amount |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs |  |  |  |  |  | $ 19,700,000 |  |  |  |  |  |  |  |  |
6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 6.125% |  | 6.125% | 6.10% |  |  |  |  |
Aggregate borrowing amount |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Capitalized debt issuance costs |  |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |  |  |
6.625% Notes, due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 6.625% | 6.625% |  |  |  | 6.625% | 6.625% | 6.60% |  |  | 6.625% |  |
Aggregate borrowing amount |  |  |  | $ 570,000,000.0 |  |  |  | $ 570,000,000 |  |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  | 58.80% |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  | 285,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from extinguishment of debt |  |  | $ (4,600,000) | (9,600,000) |  |  |  |  |  |  |  |  |  |  |
Repayment of premium on debt |  |  | 2,900,000 | 6,300,000 |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred financing costs |  |  | 1,700,000 | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |
Repurchased aggregate principal amount |  |  | $ 167,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate | 0.75% |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Minimum | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |
Minimum | 5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |
Percentage of holders of aggregate outstanding principal amount to declare acceleration of amounts due in any event of default |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Minimum | 6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holders of aggregate outstanding principal amount to declare acceleration of amounts due in any event of default |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |
Minimum | 6.625% Notes, due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt redemption notice period |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum total leverage ratio |  |  |  |  |  |  |  |  | 0.060 |  |  |  |  |  |
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |
Maximum | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Maximum | 5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | 4.00% Notes, due October 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |
Maximum | 5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Maximum | 6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |
Maximum | 6.625% Notes, due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt redemption notice period |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate borrowing amount | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 | Prior to July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 | Before July, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 6.625% Notes, due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from extinguishment of debt |  | $ (2,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred financing costs |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |
Long-term debt, gross |  | $ 117,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Salus | Collateralized Loan Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional principle amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 578,500,000

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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=120400017&loc=d3e572229-122910 Reference 3: 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=120391452&loc=d3e13212-122682 Reference 4: 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=120398452&loc=d3e534808-122878 + Details
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