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Basis of Presentation - Narrative (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2021 | Jun. 17, 2021 | Jan. 26, 2021 | Nov. 17, 2020 | Sep. 25, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 31, 2021 | Aug. 28, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash paid |  |  |  |  |  |  |  | $ 1,033,695,000 | $ 68,920,000 |  |
Payments of debt issuance costs |  |  |  |  |  |  |  | 5,643,000 | 432,000 |  |
Deferred compensation plan |  |  |  |  |  | $ 88,965,000 | $ 50,000 | 89,327,000 | (115,000) |  |
Net proceeds received |  |  |  |  |  |  |  | 0 | 58,349,000 |  |
Dividends payable (USD per share) |  |  |  |  |  |  |  |  |  |  | $ 1.50
Dividends payable |  |  |  |  |  |  |  |  |  |  | $ 392,489,000
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Nonqualified Plan |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan |  |  |  |  |  | 88,965,000 | $ 50,000 | 89,327,000 | $ (115,000) |  |
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Nonqualified Plan | DCP, One-Time Inducement |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassified cumulative compensation cost |  |  |  |  |  | 4,739,000 |  | 4,739,000 |  |  |
Deferred compensation plan |  |  |  |  |  | 90,721,000 |  | 90,721,000 |  |  |
Deferred compensation liability |  |  |  |  |  | $ 95,460,000 |  | $ 95,460,000 |  |  |
Seequent |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash paid |  | $ 910,997,000 |  |  |  |  |  |  |  |  |
Class B Common Stock | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Nonqualified Plan |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Phantom shares, maximum elections (in shares) |  |  |  |  |  |  |  |  |  | 1,500,000 |
Reduction in shares outstanding, basic (in shares) |  |  |  |  |  |  |  |  |  | 1,500,000 |
Reduction in shares outstanding, diluted (in shares) |  |  |  |  |  |  |  |  |  | 1,500,000 |
Class B Common Stock | Seequent |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 3,141,342 |  |  |  |  |  |  |  |  |
Class B Common Stock | Public Stock Offering - Shares From Existing Shareholders |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  |  | 12,360,991 |  |  |  |  |  |
Price per share sold (USD per share) |  |  |  |  | $ 22.00 |  |  |  |  |  |
Class B Common Stock | Follow-On Offering |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  | 11,500,000 |  |  |  |  |  |  |
Price per share sold (USD per share) |  |  |  | $ 32.00 |  |  |  |  |  |  |
Class B Common Stock | Follow-On Offering, Sold By Company |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  | 9,603,965 |  |  |  |  |  |  |
Class B Common Stock | Follow-On Offering, Exercise By Underwriters |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  | 1,500,000 |  |  |  |  |  |  |
Class B Common Stock | Follow-On Offering, Shares From Existing Shareholders |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  | 1,896,035 |  |  |  |  |  |  |
Net proceeds received |  |  |  | $ 294,429,000 |  |  |  |  |  |  |
Expenses associated with sale of stock |  |  |  | $ 12,898,000 |  |  |  |  |  |  |
2026 Notes: | Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [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 |  |  |  |  |  |  |  |
2027 Notes: | Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [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 |  |  |  |  |  |  |  |  |  |

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