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401(K) Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Compensation Related Costs [Abstract]
Profit sharing contribution	$ 0	$ 0

X

- References

No definition available.

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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