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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2019 $ / shares | Oct. 22, 2019 $ / shares | Jan. 02, 2019 USD ($) | Mar. 28, 2018 $ / shares | Mar. 27, 2018 USD ($) $ / shares shares | Aug. 31, 2019 $ / shares shares | May 25, 2019 $ / shares shares | Feb. 23, 2019 $ / shares shares | Aug. 31, 2019 vote $ / shares shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 52,650 | 99,500 | 45,000 | 197,150
Repurchase of common stock, value | $ |  |  | $ 100.0 |  | $ 146.0 |  |  |  |
Total cost of shares repurchased divided by the total number of shares repurchased |  |  |  |  | $ 124.00 | $ 181.61 | $ 147.47 | $ 139.57 | $ 154.78
Class B Common Stock |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  | 1,105,000 |  |  |  |
Quarterly dividend amount (in dollars per share) |  |  |  | $ 0.09 | $ 0.03 |  |  |  |
Voting rights | vote |  |  |  |  |  |  |  |  | 10
Number of shares converted (in shares) | shares |  |  |  |  |  |  |  |  | 67,000
Class B Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividend amount (in dollars per share) | $ 0.20 | $ 0.09 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  | 73,000 |  |  |  |
Quarterly dividend amount (in dollars per share) |  |  |  | $ 0.1125 | $ 0.0375 |  |  |  |
Voting rights | vote |  |  |  |  |  |  |  |  | 1
Dividend rate |  |  |  |  |  |  |  |  | 125.00%
Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividend amount (in dollars per share) | $ 0.25 | $ 0.1125 |  |  |  |  |  |  |

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