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Capital Stock and Stock-Based Awards - Schedule of capital stock (Details) - shares | May 31, 2021 | May 31, 2020
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Preferred stock, shares authorized (in shares) | 2,000,000.0 | 2,000,000.0
Preferred stock, outstanding (in shares) | 0 | 0
Class A Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common Stock, shares authorized (in shares) | 4,000,000 | 4,000,000.0
Common Stock, reserved for issuance (in shares) | 0 |
Common Stock, shares outstanding (in shares) | 1,656,200 | 1,700,000
Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common Stock, shares authorized (in shares) | 70,000,000 | 70,000,000.0
Common Stock, reserved for issuance (in shares) | 8,128,785 |
Common Stock, shares outstanding (in shares) | 32,707,795 | 32,500,000
Preferred Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Preferred stock, shares authorized (in shares) | 2,000,000 |
Preferred stock, reserved for issuance (in shares) | 0 |
Preferred stock, outstanding (in shares) | 0 |

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- Definition Aggregate number of common shares reserved for future issuance. + References 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) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate number of nonredeemable preferred shares reserved for future issuance. + References 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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