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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Less: Tax effect $ 29.3 $ 23.8
Net income (loss) attributable to Scholastic Corporation 62.5 74.2
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of unrecognized gain (loss) 0.3 0.3
Amortization of prior service (credit) loss (0.2) (0.2)
Less: Tax effect 0.1 0.1
Net income (loss) attributable to Scholastic Corporation $ 0.2 $ 0.2