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Earnings Per Share - Additional Information (Detail) - shares | 6 Months Ended | 18 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2017 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |
Repurchase of common stock (shares) |  | 0 |
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. |  |
Treasury shares (in shares) | 16,451,501 | 16,451,501 | 16,500,129
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. |  |
Treasury shares (in shares) | 12,550,275 | 12,550,275 | 12,550,275
Board Of Director Authorized |  |  |
Class of Stock [Line Items] |  |  |
Number of shares authorized to be purchased (shares) | 4,000,000 | 4,000,000 |
Treasury shares (in shares) | 3,294,513 | 3,294,513 |
Board Of Director Authorized | Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Treasury shares (in shares) | 1,425,452 | 1,425,452 |
Board Of Director Authorized | Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Treasury shares (in shares) | 1,869,061 | 1,869,061 |
Stock Repurchase Committee Authorized |  |  |
Class of Stock [Line Items] |  |  |
Number of shares authorized to be purchased (shares) |  |  | 110,241

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