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Sale of Quality Assurance Business (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Oct. 29, 2017	Oct. 30, 2016	Nov. 01, 2015	Oct. 27, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from divestitures	$ 48,033	$ 0	$ 3,938	$ 0	$ 0	$ 0	$ 1,663	$ 0	$ 51,971	$ 1,663	$ 0
Quality Assurance Business \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price												$ 66,400
Gain from divestitures	$ (48,000)
Income before provision for income taxes									$ 4,487	$ 9,822	$ 15,767

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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