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Equity Compensation Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant | 5,386,000 | 6,355,000 | 7,002,000
Options Exercisable, Weighted Average Exercise Price | $ 30.24 | $ 28.1 | $ 24.47
Compensation expense related to share based awards | $ 7,154,000 | $ 6,437,000 | $ 6,468,000
Remaining compensation cost to be expensed in future periods for non-vested options | $ 10,927,000 |  |
Weighted average expense recognition period | 2 years 10 months 24 days |  |
Number of shares purchased by employees | 43,456 | 38,406 | 43,156
2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average expense recognition period | 4 years |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 6,866,000 |  |
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant | 605,774 |  |
Number of shares authorized for grant | 1,425,000 |  |
Annual maximum limit percentage of compensation to purchase shares | 5.00% |  |
Employee stock purchase plan stock price percentage | 10.00% |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 3 years |  |
Stock option contractual terms | 5 years |  |
Minimum | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 3 years |  |
Minimum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 3 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |
Stock option contractual terms | 10 years |  |
Maximum | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |
Maximum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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