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Income Taxes Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 899	$ 899	$ 0
Increase in gross amounts of tax positions related to prior years	0	0	899
Decrease in gross amounts of tax positions related to prior years due to U.S. tax reform	(287)	0	0
Decrease due to lapse in statute of limitations	(148)	0	0
Unrecognized tax benefits, ending balance	$ 464	$ 899	$ 899

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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