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Long‑Term Debt - 2027 Convertible Senior Notes (Details) |  |  | 9 Months Ended
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Jun. 28, 2021 USD ($) share_rate day $ / shares | Jan. 26, 2021 USD ($) share_rate day $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |
Payments of debt issuance costs | $ |  |  | $ 5,643,000 | $ 432,000
2027 Notes: | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ | $ 575,000,000 |  |  |
Debt instrument, interest rate, stated percentage | 0.375% |  |  |
Payments of debt issuance costs | $ | $ 15,065,000 |  |  |
Payments of expenses associated with initial public offering | $ | $ 25,875,000 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |
Debt instrument, convertible, threshold trading days | 20 |  |  |
Debt instrument, convertible, threshold consecutive trading days | 30 |  |  |
Debt instrument, redemption price, percentage | 98.00% |  |  |
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate | 12.0153 |  |  |
Debt instrument, convertible, conversion price (USD per share) | $ / shares | $ 83.23 |  |  |
Number of trading days after maturity date, debt redeemable | 40 days |  |  |
Effective interest rate | 0.864% |  |  |
2027 Notes: | Convertible Debt | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares | $ 61.65 |  |  |
2027 Notes: | Convertible Debt | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate | 16.2206 |  |  |
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares | $ 325.00 |  |  |
Debt covenant, percent of note holders threshold by amount of principal outstanding | 25.00% |  |  |
2027 Notes: | Convertible Debt | Debt Conversion Terms One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, threshold trading days | 20 |  |  |
Debt instrument, convertible, threshold consecutive trading days | 30 |  |  |
2027 Notes: | Convertible Debt | Debt Conversion Terms Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, threshold consecutive business days | 5 |  |  |
Debt instrument, convertible, threshold consecutive trading days, after threshold consecutive business days | 10 |  |  |
2027 Notes: | Convertible Debt | Accounts Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payments of debt issuance costs | $ |  |  | $ 375,000 |
2026 Notes: | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ |  | $ 690,000,000 |  |
Debt instrument, interest rate, stated percentage |  | 0.125% |  |
Payments of debt issuance costs | $ |  | $ 18,055,000 |  |
Payments of expenses associated with initial public offering | $ |  | 25,530,000 |  |
Repayment of credit facility | $ | $ 536,062,000 | $ 250,500,000 |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  | 130.00% |  |
Debt instrument, convertible, threshold trading days |  | 20 |  |
Debt instrument, convertible, threshold consecutive trading days |  | 30 |  |
Debt instrument, redemption price, percentage |  | 98.00% |  |
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate |  | 15.5925 |  |
Debt instrument, convertible, conversion price (USD per share) | $ / shares |  | $ 64.13 |  |
Number of trading days after maturity date, debt redeemable |  | 40 days |  |
Effective interest rate |  | 0.658% |  |
2026 Notes: | Convertible Debt | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares |  | $ 44.23 |  |
2026 Notes: | Convertible Debt | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate |  | 22.6090 |  |
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares |  | $ 210.00 |  |
Debt covenant, percent of note holders threshold by amount of principal outstanding |  | 25.00% |  |
2026 Notes: | Convertible Debt | Debt Conversion Terms One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, threshold trading days |  | 20 |  |
Debt instrument, convertible, threshold consecutive trading days |  | 30 |  |
2026 Notes: | Convertible Debt | Debt Conversion Terms Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, threshold consecutive business days |  | 5 |  |
Debt instrument, convertible, threshold consecutive trading days, after threshold consecutive business days |  | 10 |  |

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