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Income Taxes - Additional Information (Detail)	3 Months Ended
	Aug. 31, 2016 USD ($)
Income Tax Contingency [Line Items]
Deferred tax assets	$ 48,700,000
Federal net operating loss and tax credit carryforwards	32,000,000
State net operating loss carryforwards	7,700,000
Differences between financial and tax reporting	9,000,000
Federal [Member]
Income Tax Contingency [Line Items]
Federal net operating loss and tax credit carryforwards	345,000
State [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforwards	$ 63,000
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	20 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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