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Earnings Per Share - Additional Information (Detail) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017
Class A Common Stock |  |
Class of Stock [Line Items] |  |
Percentage of shares outstanding used in two class method calculation | 40.00% |
Voting rights | The Class A Common Stock has no voting rights unless four quarterly cumulative dividends upon the Class A Common Stock are in arrears. |
Class B Common Stock |  |
Class of Stock [Line Items] |  |
Percentage of shares outstanding used in two class method calculation | 60.00% |
Voting rights | The Class B Common Stock has full voting rights. |
Board Of Director Authorized |  |
Class of Stock [Line Items] |  |
Number of shares authorized to be purchased (shares) | 4,703,487 |
Stock Repurchase Committee Authorized |  |
Class of Stock [Line Items] |  |
Repurchase of common stock (shares) |  | 2,000

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