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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 04, 2018	Feb. 28, 2017	Mar. 04, 2018	Feb. 28, 2017
Income Tax Contingency [Line Items]
Deferred tax assets	$ 32,000,000		$ 32,000,000
Federal net operating loss and tax credit carryforwards	20,100,000		20,100,000
State net operating loss carryforwards	7,200,000		7,200,000
Differences between financial and tax reporting	4,700,000		4,700,000
Decrease in deferred income tax account balances			(14,600,000)
Income tax expense (benefit)	0	$ 0	0	$ 0
Federal [Member]
Income Tax Contingency [Line Items]
Federal net operating loss and tax credit carryforwards	1,775,000		1,775,000
Income tax expense (benefit)	0	0
State [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforwards	412,000		$ 412,000
Income tax expense (benefit)	$ 0	$ 0
Minimum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards useful life			10 years
Minimum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards useful life			1 year
Maximum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards useful life			20 years
Maximum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards useful life			20 years

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