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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2026 | Feb. 28, 2025 | Feb. 28, 2026 | Feb. 28, 2025 | Nov. 30, 2025 | Aug. 31, 2025 | May 31, 2025 | Nov. 30, 2024 | Aug. 31, 2024 | May 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | $ 7.7 | $ (8.0) | $ 7.4 | $ (11.7) |  |  |  |  |  |
Amortization of net actuarial (gain) loss (net of tax of $0.0) | 0.4 | 0.3 | 1.2 | 1.0 |  |  |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.1) | (0.2) | (0.2) | (0.5) | (0.5) |  |  |  |  |  |
Other comprehensive income (loss) | 7.9 | (7.9) | 8.1 | (11.2) |  |  |  |  |  |
Reclassification adjustment from AOCI, tax | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Amortization of prior service credit, tax | 0.1 | 0.1 | 0.2 | 0.2 |  |  |  |  |  |
Total stockholders’ equity of Scholastic Corporation | 871.9 | 941.3 | 871.9 | 941.3 | $ 931.2 | $ 878.0 | $ 946.5 | $ 986.0 | $ 957.3 | $ 1,018.1
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Total stockholders’ equity of Scholastic Corporation | (33.4) | (63.7) | (33.4) | (63.7) | (41.3) | $ (37.7) | (41.5) | (55.8) | $ (44.1) | (52.5)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 7.7 | (8.0) | 7.4 | (11.7) |  |  |  |  |  |
Amortization of net actuarial (gain) loss (net of tax of $0.0) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.1) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Other comprehensive income (loss) | 7.7 | (8.0) | 7.4 | (11.7) |  |  |  |  |  |
Total stockholders’ equity of Scholastic Corporation | (28.6) | (58.6) | (28.6) | (58.6) | (36.3) |  | (36.0) | (50.6) |  | (46.9)
Retirement benefit plans |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Amortization of net actuarial (gain) loss (net of tax of $0.0) | 0.4 | 0.3 | 1.2 | 1.0 |  |  |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.1) | (0.2) | (0.2) | (0.5) | (0.5) |  |  |  |  |  |
Other comprehensive income (loss) | 0.2 | 0.1 | 0.7 | 0.5 |  |  |  |  |  |
Total stockholders’ equity of Scholastic Corporation | $ (4.8) | $ (5.1) | $ (4.8) | $ (5.1) | $ (5.0) |  | $ (5.5) | $ (5.2) |  | $ (5.6)

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