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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 03, 2017	Nov. 30, 2016	Dec. 03, 2017	Nov. 30, 2016
Income Tax Contingency [Line Items]
Deferred tax assets	$ 46,700,000		$ 46,700,000
Federal net operating loss and tax credit carryforwards	32,400,000		32,400,000
State net operating loss carryforwards	7,200,000		7,200,000
Differences between financial and tax reporting	7,100,000		7,100,000
Income tax expense (benefit)	0	$ 0	0	$ 0
Federal [Member]
Income Tax Contingency [Line Items]
Federal net operating loss and tax credit carryforwards	1,582,000		1,582,000
Income tax expense (benefit)	0	0
State [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforwards	326,000		$ 326,000
Income tax expense (benefit)	$ 0	$ 0
Minimum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			11 years
Minimum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			1 year
Maximum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			18 years
Maximum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			20 years

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