Financial Instruments And Fair Value Measurements - Estimated Fair Values for the Company's Senior Notes and the Assets Held by Special Purpose Entities (Detail) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Oct. 31, 2013
Senior Notes Due 2017 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	$ 327.0	$ 334.5
Senior Notes Due 2019 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	288.8	289.9
Senior Notes Due 2021 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	320.8	317.9
Assets held by special purpose entities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	$ 54.2	$ 50.1