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Equity Compensation Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2019 | May 31, 2018
Compensation expense related to share based awards | $ 1,306,000 | $ 1,026,000 | $ 4,137,000 | $ 3,692,000 |  |
Weighted-average fair value per share of stock options granted |  |  |  |  |  | $ 14.91
During Fiscal 2019 |  |  |  |  |  |
Weighted-average fair value per share of stock options granted |  |  |  |  | $ 14.44 |
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan |  |  |  |  |  |
Annual maximum limit percentage of compensation to purchase shares |  |  | 5.00% |  |  |
Minimum |  |  |  |  |  |
Stock option vesting period |  |  | 3 years |  |  |
Stock option contractual terms |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |
Stock option vesting period |  |  | 5 years |  |  |
Stock option contractual terms |  |  | 10 years |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of capitalized and expensed compensation cost from equity-based compensation arrangements. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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