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, 2016	Oct. 31, 2015
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
Estimated Fair Value Of Financial Instruments [Line Items]
Assets held by special purpose entities Estimated fair value	54.3	54.4
Senior Notes Due 2017 | Estimate of Fair Value Measurement
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value of debt instruments	302.4	314.8
Senior Notes Due 2019 | Estimate of Fair Value Measurement
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value of debt instruments	280.1	280.6
Senior Notes Due 2021 | Estimate of Fair Value Measurement
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value of debt instruments	$ 264.9	$ 258.7