Stock-based Compensation and Stockholders' Equity - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Feb. 28, 2021	Feb. 28, 2021	Jul. 14, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted options (in shares)	100,000,000	672,600,000
Shares for future issuance (in shares)	4,100,000	4,100,000
Unrecognized compensation expense	$ 4,100,000	$ 4,100,000
Repurchase plan authorized amount (up to)	$ 3,800,000	$ 3,800,000	$ 10,000,000.0
Treasure shares acquired (in shares)		0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	17,500,000	188,225,000
Weighted-average period (in years)		1 year 6 months 21 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period (in years)		2 years 2 months 26 days

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Publisher FASB
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-SubTopic 10
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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