The life expectancy of the carryforwards related to net operating losses and tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Income Tax Contingency [Line Items]
Deferred tax assets	$ 50,000,000		$ 50,000,000
Federal net operating loss and tax credit carryforwards	34,000,000		34,000,000
State net operating loss carryforwards	8,000,000		8,000,000
Differences between financial and tax reporting	8,000,000		8,000,000
Income tax expense	0	$ 0	0	$ 0
Federal [Member]
Income Tax Contingency [Line Items]
Income tax expense	307,000		307,000
State [Member]
Income Tax Contingency [Line Items]
Federal net operating loss and tax credit carryforwards	307,000		307,000
State net operating loss carryforwards	74,000		74,000
Income tax expense	$ 74,000		$ 74,000
Minimum [Member] \| Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			13 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			20 years
Maximum [Member] \| State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			20 years