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Capital Transactions - Summary of the Awards Each Year (Detail) - Class B Common Stock [Member] - shares | 6 Months Ended
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Jun. 30, 2019 | Jul. 01, 2018
Schedule of Capitalization, Equity [Line Items] |  |
Date of approval for award | Mar. 05, 2019 | Mar. 06, 2018
Fiscal year of service covered by award | 2018 | 2017
Shares settled in cash to satisfy tax withholding obligations | 15,476 | 16,504
Increase in Class B Common Stock shares outstanding | 19,224 | 20,296
Total Class B Common Stock awarded | 34,700 | 36,800

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