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Shareholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) $ / shares shares | May 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 vote
Class of Stock [Line Items] |  |  |  |
Public offering price per share (in dollars per share) | $ / shares | $ 900.00 | $ 700.00 | $ 317.50 |
Proceeds from follow-on public offering, net of issuance costs | $ 1,117,646 | $ 1,460,945 | $ 688,014 |
Stock issuance costs | $ 20,854 | $ 28,305 | 5,724 |
Stock issuance costs, tax |  |  | $ 1,541 |
Class A Subordinate Voting |  |  |  |
Class of Stock [Line Items] |  |  |  |
Voting rights (in votes per share) | vote |  |  |  | 1
Class B Multiple Voting |  |  |  |
Class of Stock [Line Items] |  |  |  |
Voting rights (in votes per share) | vote |  |  |  | 10
Voting shares convertible (per share) |  |  |  | 1
IPO | Class A Subordinate Voting |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of stock (in shares) | shares | 1,265,000 | 2,127,500 | 2,185,000 |
Over-Allotment Option | Class A Subordinate Voting |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of stock (in shares) | shares |  | 277,500 | 285,000 |

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