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Stock-Based Compensation (Tables) | 6 Months Ended
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Dec. 31, 2023
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based compensation expense | Stock-based compensation expense, which is included in student services and administrative expense, and the related income tax benefit were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
Stock-based compensation | ​ | $ | 6,050 | ​ | $ | 1,968 | ​ | $ | 13,505 | ​ | $ | 8,113
Income tax benefit | ​ |  | (2,488) | ​ |  | (622) | ​ |  | (4,983) | ​ |  | (2,303)
Stock-based compensation, net of tax | ​ | $ | 3,562 | ​ | $ | 1,346 | ​ | $ | 8,522 | ​ | $ | 5,810
Summary of Options Activity | The following table summarizes stock option activity for the six months ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted-Average | ​ | ​
​ | ​ | Number of | ​ | ​ | ​ | Remaining | ​ | Aggregate
​ | ​ | Stock | ​ | Weighted-Average | ​ | Contractual Life | ​ | Intrinsic Value
​ | ​ | Options | ​ | Exercise Price | ​ | (in years) | ​ | (in thousands)
Outstanding as of July 1, 2023 |  | 1,045,801 | ​ | $ | 36.02 |  | ​ | ​ | ​ | ​
Exercised |  | (451,040) | ​ | ​ | 33.95 |  | ​ | ​ | ​ | ​
Expired |  | (1,144) | ​ | ​ | 28.32 |  | ​ | ​ | ​ | ​
Outstanding as of December 31, 2023 |  | 593,617 | ​ |  | 37.61 |  | 6.4 | ​ | $ | 12,669
Exercisable as of December 31, 2023 |  | 453,942 | ​ | $ | 38.36 |  | 6.1 | ​ | $ | 9,349
Summary of Restricted Stock Units Activity | The following table summarizes RSU activity for the six months ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
Unvested as of July 1, 2023 |  | 737,733 | ​ | $ | 37.22
Granted |  | 393,270 | ​ |  | 44.17
Vested |  | (282,447) | ​ |  | 37.85
Forfeited |  | (11,847) | ​ |  | 40.42
Unvested as of December 31, 2023 |  | 836,709 | ​ | $ | 40.23
Summary of Performance Shares Unit Activity | The following table summarizes PSU activity for the six months ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | PSUs | ​ | Fair Value
Unvested as of July 1, 2023 |  | 490,300 | ​ | $ | 35.17
Granted (1) |  | 333,210 | ​ |  | 50.07
Vested |  | (126,918) | ​ |  | 29.92
Forfeited |  | (48,712) | ​ |  | 31.50
Unvested as of December 31, 2023 |  | 647,880 | ​ | $ | 43.79
(1) Includes incremental PSUs awarded upon achievement of metrics.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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