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Summary of Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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May 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Table Text Block] |
|  | Quarter Ended |
(in thousands, except per share) |  | August 2019 |  |  | November 2019 |  |  | February 2020 |  |  | May 2020 |
Total Revenue |  | $ | 101,424 |  |  | $ | 107,803 |  |  | $ | 99,869 |  |  | $ | 109,074 |
Gross Margin |  |  | 48,194 |  |  |  | 51,026 |  |  |  | 45,330 |  |  |  | 51,729 |
Net income |  |  | 14,652 |  |  |  | 16,276 |  |  |  | 12,200 |  |  |  | 16,347 |
Basic net income per share |  | $ | 0.28 |  |  | $ | 0.31 |  |  | $ | 0.23 |  |  | $ | 0.31 |
Diluted net income per share |  | $ | 0.28 |  |  | $ | 0.31 |  |  | $ | 0.23 |  |  | $ | 0.31 |
|  | Quarter Ended |
(in thousands, except per share) |  | August 2018 |  |  | November 2018 |  |  | February 2019 |  |  | May 2019 |
Total Revenue |  | $ | 99,626 |  |  | $ | 107,098 |  |  | $ | 97,700 |  |  | $ | 109,762 |
Gross Margin |  |  | 46,729 |  |  |  | 50,033 |  |  |  | 44,628 |  |  |  | 50,530 |
Net income |  |  | 15,237 |  |  |  | 16,051 |  |  |  | 13,073 |  |  |  | 15,815 |
Basic net income per share |  | $ | 0.29 |  |  | $ | 0.31 |  |  | $ | 0.25 |  |  | $ | 0.31 |
Diluted net income per share |  | $ | 0.29 |  |  | $ | 0.31 |  |  | $ | 0.25 |  |  | $ | 0.30 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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