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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		10 Months Ended	11 Months Ended	12 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Dec. 31, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 407,000	$ 201,000	$ 1,046,000	$ 579,000
Income tax benefit from windfall of stock	98,000		210,000
Prior period tax benefits recognized upon completion of R&D study		$ 334,000	78,000	$ 334,000
Cumulative unrecognized tax benefits	626,000		$ 626,000		$ 626,000		$ 665,000
Developments affecting unrecognized tax benefits	$ 0
United States federal statutory income tax rate					21.00%	35.00%
One-time non-cash charge related to re-measurement of deferred tax assets							1,000,000
Change in net deferred tax assets							1,000,000
Provisional expense recorded for Transition Tax							$ 100,000
Percentage of deduction on income tax liability			50.00%
Percentage of effect on taxable income due to Tax Act			80.00%

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