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Investments	6 Months Ended
	Nov. 30, 2019
Investments Debt And Equity Securities [Abstract]
Investments	6.  INVESTMENTS As of November 30, 2019, we had $13.0 million invested in CDs which mature in less than twelve months. The fair value of these investments was equal to the face value of the CDs. As of June 1, 2019, we had $8.0 million invested in CDs which mature in less than twelve months. The fair value of these investments was equal to the face value of the CDs.

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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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