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Other Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Company's contributions to 401(K) plan | $ 8.2 | $ 7.7 | $ 7.4
Common stock shares purchase price limit for employees as percentage of market value under ESPP | 90.00% |  |
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation | 10.00% |  |
Maximum number of shares available for purchase by participating employees (in shares) | 2,500,000 |  |
Australia / New Zealand |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long service leave expense | $ 8.6 | $ 8.7 | $ 8.4
Strategic Education, Inc. 401(k) Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of company matching contribution to 401(K) plan, first tier | 100.00% |  |
Defined contribution plan employer matching contribution percent, first tier | 2.00% |  |
Percentage of company matching contribution to 401(K) plan, second tier | 50.00% |  |
Defined contribution plan employer matching contribution percent, second tier | 2.00% |  |
Defined contribution plan maximum employer matching contribution percent | 3.00% |  |

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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Other employee benefit expense includes, but is not limited to, service component of net periodic benefit cost for defined benefit plan. Excludes compensation cost in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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