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Debt and Credit Facilities - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jul. 01, 2014 USD ($) | Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) Extension | Aug. 31, 2020 USD ($) d $ / shares shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) d $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Jan. 01, 2021 USD ($) | Aug. 10, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  |  | $ 221,200,000 |  |  | $ 221,200,000 |  | $ 193,100,000 |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  |  | 0 | $ 13,808,000 |  |  |  |
Deferred tax liabilities |  |  |  |  | 23,554,000 |  |  | 23,554,000 |  | 12,285,000 |  |  |
Deferred tax assets |  |  |  |  | 147,260,000 |  |  | 147,260,000 |  | 130,200,000 |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, fair value |  |  |  |  | 223,100,000 |  |  | 223,100,000 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  |  |  | 200,000,000 |  |  | 200,000,000 |  | 200,000,000 |  |  |
Senior Note, Series A |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note, amount paid |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 0.25% |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | 700,000 | $ 1,600,000 |  | $ 2,200,000 | 1,600,000 | 4,400,000 |  |  |
Debt amount |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Exercise of option by initial purchasers aggregate principal amount |  |  |  | 50,000,000.0 |  |  |  |  |  |  |  |  |
Proceeds from issuance and sale of debt |  |  |  | 389,700,000 |  |  |  |  |  |  |  |  |
Transaction fees and other third-party offering expenses |  |  |  | $ 10,300,000 |  |  |  |  |  |  |  |  |
Debt instrument, payment terms |  |  |  |  |  |  |  | The Convertible Senior Notes accrue interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021 |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  |  |  |  | semi-annually |  |  |  |  |
Maturity Date |  |  |  | Aug. 15, 2025 |  |  |  |  |  |  |  |  |
Convertible note converted each amount |  |  |  |  | $ 1,000 |  |  | $ 1,000 |  |  |  |  |
Convertible notes converted each into shares of common stock | shares |  |  |  |  |  |  |  | 22.2913 |  |  |  |  |
Debt Instrument, conversion price | $ / shares |  |  |  |  | $ 44.86 |  |  | $ 44.86 |  |  |  |  |
Threshold trading days | d |  |  |  | 20 |  |  |  | 51 |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 30 |  |  |  |  |  |  |  |  |
Conversion percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |  |
Number of business day period |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Consecutive trading day period |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Convertible principal amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Measurement period, percentage |  |  |  | 98.00% |  |  |  |  |  |  |  |  |
Percentage of principal amount to redeem convertible senior notes |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Percentage of convertible senior notes repurchased at cash |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Debt liability |  |  |  | $ 336,100,000 |  |  |  |  |  |  |  |  |
Debt instrument convertible notes additional paid in capital |  |  |  | $ 53,600,000 |  |  |  |  |  |  |  |  |
Convertible senior notes effective interest rate |  |  |  | 3.25% |  |  |  |  |  |  |  |  |
Net carrying value of notes |  |  |  |  | $ 400,000,000.0 |  |  | $ 400,000,000.0 |  | 340,600,000 |  |  |
Bond hedge term |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Number of shares issuable upon conversion | shares |  |  |  | 8,900,000 |  |  |  |  |  |  |  |  |
Cost of convertible note hedge transaction |  |  |  | $ 55,000,000.0 |  |  |  |  |  |  |  |  |
Number of common stock acquired by offsetting sale warrants. | shares |  |  |  |  |  |  |  | 8,900,000 |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 66.46 |  |  | $ 66.46 |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  |  | $ 13,800,000 |  |  |  |  |
Convertible Senior Notes | ASU 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of equity component of convertible senior notes to liabilities |  |  |  |  |  |  |  |  |  |  | $ 55,000,000.0 |  |
Reclassification of equity component of debt issuance costs to liabilities |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Carrying amount of convertible senior notes adjusted in retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 3,700,000 |
Convertible Note Hedge And Warrant Transaction |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of bond hedges and sale of warrants |  |  |  | $ 41,200,000 |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  | $ 16,200,000 |  |  | 16,200,000 |  |  |  |  |
Deferred tax assets |  |  |  |  | 16,500,000 |  |  | 16,500,000 |  |  |  |  |
Convertible Note Hedge And Warrant Transaction | ASU 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability reversed |  |  |  |  | 13,900,000 |  |  | 13,900,000 |  |  |  |  |
Additional deferred tax liability related to capitalized debt issuance costs |  |  |  |  | 400,000 |  |  | 400,000 |  |  |  |  |
Adjustment to deferred tax asset through retained earnings |  |  |  |  | 900,000 |  |  | 900,000 |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Debt amount | 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable |  |  |  |  | 2,000,000.0 |  |  | 2,000,000.0 |  | $ 5,500,000 |  |  |
Private Placement | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | 2,700,000 | 3,100,000 |  | 8,900,000 | 9,300,000 |  |  |  |
Interest payments |  |  |  |  | $ 6,200,000 | 6,200,000 |  | $ 12,400,000 | 12,400,000 |  |  |  |
Private Placement | Senior Note, Series A |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amount | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date | Jul. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, conversion price | $ / shares |  |  |  | $ 44.86 |  |  |  |  |  |  |  |  |
Percentage of bond hedge and warrant transactions increased conversion price |  |  |  | 35.00% |  |  |  |  |  |  |  |  |
Maximum | Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, conversion price | $ / shares |  |  |  | $ 66.46 |  |  |  |  |  |  |  |  |
Percentage of bond hedge and warrant transactions increased conversion price |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement date |  |  | Jun. 30, 2021 |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 650,000,000 |  |  |  | $ 650,000,000 |  |  |  |  |  |
Debt issuance costs incurred |  |  | 1,900,000 |  |  |  | 1,900,000 |  |  |  |  |  |
Revolving credit facility |  |  | $ 550,000,000 |  |  |  | $ 550,000,000 |  |  |  |  |  |
Credit agreement maturity period |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Credit agreement number of extensions | Extension |  |  | 2 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.34% |  |  | 1.34% |  | 1.87% |  |  |
Letters of credit outstanding amount |  |  |  |  | $ 45,000,000.0 |  |  | $ 45,000,000.0 |  | $ 44,900,000 |  |  |
Interest expense |  |  |  |  | 100,000 | $ 200,000 |  | 600,000 | $ 900,000 |  |  |  |
Debt instrument, outstanding amount |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |
Unsecured Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Unsecured Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  |  |  | 0.625% |  |  |  |  |  |
Unsecured Revolving Credit Facility | Euro Currency Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Unsecured Revolving Credit Facility | Euro Currency Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  |  |  | 1.625% |  |  |  |  |  |

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