Financial Instruments And Fair Value Measurements - Estimated Fair Values for the Company's Senior Notes and Assets Held by Special Purpose Entities (Detail) - USD ($) $ in Millions	Oct. 31, 2015	Oct. 31, 2014
Estimated Fair Value Of Financial Instruments [Line Items]
Assets held by special purpose entities Estimated fair value	$ 50.9	$ 50.9
Estimate of Fair Value Measurement [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Assets held by special purpose entities Estimated fair value	54.4	54.5
Senior Notes Due 2017 [Member] | Estimate of Fair Value Measurement [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	314.8	325.5
Senior Notes Due 2019 [Member] | Estimate of Fair Value Measurement [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	280.6	287.5
Senior Notes Due 2021 [Member] | Estimate of Fair Value Measurement [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	$ 258.7	$ 297.7