Fair Value Measurement (Tables)

12 Months Ended

May 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Available-for-Sale Securities Recorded in Long Term Investments Measured and Recorded at Fair Value on Recurring Basis

	As of May 31, 2018
Description	Quoted Prices in Active Market for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	US$		US$		US$		US$
Long-term investments:
Available-for-sale investments		153,294		98,504		133,897		385,695

	As of May 31, 2019
Description	Quoted Prices in Active Market for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	US$		US$		US$		US$
Long-term investments:
Equity securities with readily determinable fair values		47,841		—		—		47,841
Available-for-sale investments		—		78,879		145,881		224,760
Contingent consideration payable (Note 3)		—		—		15,150		15,150
Total		47,841		78,879		161,031		287,751

Reconciliation of the fair value measurements of assets and liabilities using significant unobservable inputs

The following table provides additional information about the reconciliation of the fair value measurements of assets and liabilities using significant unobservable inputs (level 3).

	Level 3 investments
	US$
Balance as of June 1, 2017		123,029
Transfer to level 1 fair value measurements		(32,644	)
Unrealized gain		43,512
Balance as of May 31, 2018		133,897
Initial recognition		45,989
Unrealized loss		(18,855	)
Balance as of May 31, 2019		161,031