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Shareholder's Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Oct. 31, 2014	Jun. 19, 2014	Oct. 25, 2013
Class Of Stock [Line Items]
Preferred stock shares authorized	25,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value	$ 100
Common stock, shares authorized	60,000,000us-gaap_CommonStockSharesAuthorized		60,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value	$ 0.20		$ 0.20
Preferred stock shares outstanding	0us-gaap_PreferredStockSharesOutstanding
Number of shares authorized to be repurchased		$ 200
Series B Preferred Stock
Class Of Stock [Line Items]
Preferred stock shares authorized	475,000
Preferred stock, par value	$ 1.00
Preferred stock shares outstanding	0