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Shareholders' Equity - Stock-Based Compensation Additional Information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 30, 2018 | May 27, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of stock options exercised |  |  | $ 409,029 | $ 311,354 |
Remaining unamortized compensation cost related to unvested stock options and RSUs |  |  | $ 227,523 | $ 157,175 |
Remaining unamortized compensation cost related to unvested stock options and RSUs, period of recognition |  |  | 2 years 2 months 27 days |  |
Restricted share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) |  |  | 1,127,094 | 1,172,707 |
Stock Option Plan | Class A Subordinate Voting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Trading days used to calculate volume weighted average trading price |  | 5 days |  |  |
Stock Option Plan | Employee and Non-Employee Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 24 months | 36 months |  |  |
Stock Option Plan | Employee and Non-Employee Stock Options | First Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) | 33.33333% | 25.00% |  |  |
Stock Option Plan | Employee and Non-Employee Stock Options | Second Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) | 33.33333% |  |  |  |
Stock Option Plan | Employee and Non-Employee Stock Options | Third Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) | 33.33333% |  |  |  |
Legacy Option Plan | Class B Multiple Voting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares receivable per option exercised (in shares) |  | 1 |  |  |
Legacy Option Plan | Employee and Non-Employee Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period |  | 36 months |  |  |
Legacy Option Plan | Employee and Non-Employee Stock Options | First Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Legacy Option Plan | Employee and Non-Employee Stock Options | Second Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Legacy Option Plan | Employee and Non-Employee Stock Options | Third Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Legacy Option Plan | Employee and Non-Employee Stock Options | Fourth Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
LTIP | Class A Subordinate Voting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares receivable per option exercised (in shares) | 1 |  |  |  |
LTIP | Employee and Non-Employee Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 24 months |  |  |  |
LTIP | Restricted share units | First Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
RSU Vesting (as a percent) | 33.33% |  |  |  |
LTIP | Restricted share units | Second Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
RSU Vesting (as a percent) | 33.33% |  |  |  |
LTIP | Restricted share units | Third Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
RSU Vesting (as a percent) | 33.33% |  |  |  |
LTIP | Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) |  |  | 0 |  |
LTIP | Deferred Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) |  |  | 347 |  |
Prior to November 2017 RSUs | Employee and Non-Employee Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period |  | 36 months |  |  |
Prior to November 2017 RSUs | Restricted share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 4 years |  |  |
Prior to November 2017 RSUs | Restricted share units | First Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Prior to November 2017 RSUs | Restricted share units | Second Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Prior to November 2017 RSUs | Restricted share units | Third Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Prior to November 2017 RSUs | Restricted share units | Fourth Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting amount (as a percent) |  | 25.00% |  |  |
Stock Option Plan and LTIP | Class A Subordinate Voting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) |  | 3,743,692 |  |  |
Shares available for issuance, percentage of annual increase |  | 5.00% |  |  |
Subsequent Event | Stock Option Plan and LTIP | Class A Subordinate Voting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) |  |  |  |  | 15,047,030

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