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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended
	May 01, 2015	May 01, 2015	May 02, 2014	Oct. 31, 2014	May 02, 2014
Income Taxes [Line Items]
Income tax rate	17.30%	21.30%	20.20%	20.30%
Discrete tax expense (benefits)		$ 0.8	$ (1.1)
Change in unrecognized tax benefit within the next twelve months	2.5	2.5
Related to reconciling the prior year’s income tax return to the income tax provision
Income Taxes [Line Items]
Discrete tax benefit due to reconciliation of income tax return	0.3	2.3
Discrete tax benefit due to release of reserves for uncertain tax positions			0.6
As a result of the enactment of tax laws reducing the U.K. statutory income tax rate
Income Taxes [Line Items]
Discrete tax benefit due to a change in Tax Laws			0.5		0.6
Due to the retroactive extension of the U.S. federal research and experimentation credits
Income Taxes [Line Items]
Discrete tax benefit due to a change in Tax Laws		$ 1.5