Common Stock (Details) shares in Millions	6 Months Ended
	Apr. 30, 2017 shares
Common Stock Disclosure Details [Abstract]
Amount of non-voting common stock shares authorized by the Company's Board of Directors to be repurchased under the current share repurchase plan	8.0
Non-voting common stock shares repurchased and retired under the Company's current share repurchase plan during the period	1.0
Non-voting common stock shares repurchased and retired under the Company's previous repurchase authorization during the period	0.9
Non-voting shares remaining to be repurchased and retired under the Company's current share repurchase plan as of the end of the period	7.0
Date on which the current Non-Voting Common Stock share repurchase program was announced	Jan. 11, 2017