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v3.20.2

Credit Agreements - Additional Information (Details) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2020 USD ($) | Apr. 03, 2018 USD ($) | May 31, 2018 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 CNY (¥) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 CNY (¥)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, net |  |  |  |  | $ 817,600,000 |  | $ 819,000,000.0 |
Letters of credit outstanding |  |  |  |  | 57,900,000 |  |  |
Uncommitted Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available borrowing capacity | ¥ |  |  |  |  |  |  |  | ¥ 220,000,000.0
Short term debt |  |  |  |  |  |  |  |
Line of credit outstanding |  |  |  |  | $ 4,900,000 | ¥ 35,000,000.0 |  |
Line of credit variable interest rate |  |  |  |  | 3.50% |  |  |
Interest Expense |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |
Debt extinguishment expense |  |  |  |  | $ 8,500,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 850,000,000 |  |  |  |  |  |
Maturity month and year |  | 2023-04 |  |  |  |  |  |
Available borrowing capacity |  |  |  |  | $ 792,100,000 |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of credit fees percentage on available borrowing capacity, low end of range (as a percent) |  |  |  |  | 0.563% | 0.563% |  |
Letter of credit fees percentage on available borrowing capacity, high end of range (as a percent) |  |  |  |  | 1.75% | 1.75% |  |
Senior Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maturity month and year |  | 2023-04 |  |  |  |  |  |
Debt, net |  | $ 325,000,000 |  |  | $ 224,600,000 |  | $ 274,400,000 |
Quarterly principal installment, at commencement |  | 4,100,000 |  |  |  |  |  |
Payment due at maturity |  | $ 264,100,000 |  |  |  |  |  |
Amount of balloon payment paid |  |  |  |  | $ 39,100,000 |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  | 1.43% |  |  |
Long term debt |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 49,200,000 |  |  |  |  |
Senior Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest spread in basis points (as a percent) |  |  |  |  | 1.25% | 1.25% |  |
Maximum leverage ratio |  |  |  |  | 3.75 |  |  |
Minimum interest coverage ratio |  |  |  |  | 2.50 |  |  |
Senior Credit Agreement | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, unused commitment fee rate (as a percent) |  |  |  |  | 0.125% | 0.125% |  |
Senior Credit Agreement | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, unused commitment fee rate (as a percent) |  |  |  |  | 0.275% | 0.275% |  |
Senior Credit Agreement | Federal Funds Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest spread in basis points (as a percent) |  |  |  |  | 0.50% | 0.50% |  |
Senior Credit Agreement | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest spread in basis points (as a percent) |  |  |  |  | 1.00% | 1.00% |  |
5.375% Senior Notes due March 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maturity month and year |  |  |  |  |  |  | 2025-03 |
Debt, net |  |  |  |  |  |  | $ 248,000,000.0 |
Long term debt |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 250,000,000.0 |  |  |  |
Debt instrument interest rate, stated percentage |  |  |  | 5.375% |  |  | 5.375% | 5.375%
Maturity date |  |  |  | Mar. 01, 2025 |  |  |  |
4.600% Senior Notes Due May 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maturity month and year |  |  |  |  | 2028-05 | 2028-05 | 2028-05 |
Debt, net |  |  |  |  | $ 296,900,000 |  | $ 296,600,000 |
Long term debt |  |  |  |  |  |  |  |
Debt issued |  |  | $ 300,000,000.0 |  |  |  |  |
Debt instrument interest rate, stated percentage |  |  | 4.60% |  | 4.60% |  | 4.60% | 4.60%
Maturity date |  |  | May 15, 2028 |  |  |  |  |
Debt instruments |  |  |  |  |  |  |  |
Debt instrument, fair value |  |  |  |  | $ 327,000,000 |  | $ 322,000,000 |
3.100% Senior Notes due March 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maturity month and year |  |  |  |  | 2030-03 | 2030-03 |  |
Debt, net |  |  |  |  | $ 296,100,000 |  |  |
Long term debt |  |  |  |  |  |  |  |
Debt issued | $ 300,000,000.0 |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | 3.10% |  |  |  | 3.10% |  |  |
Maturity date | Mar. 01, 2030 |  |  |  |  |  |  |
Debt instrument, redemption discount | $ 1,200,000 |  |  |  |  |  |  |
Debt issuance costs capitalized | $ 2,900,000 |  |  |  |  |  |  |
Debt instruments |  |  |  |  |  |  |  |
Debt instrument, fair value |  |  |  |  | $ 301,000,000 |  |  |

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