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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Less: Tax effect $ (20.7) $ (12.4) $ (11.8) $ (0.4)
Net income (loss) attributable to Scholastic Corporation (68.3) (35.1) (44.1) 4.7
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) 0.2 0.2 0.4 0.3
Amortization of prior service (credit) loss (0.2) (0.2) (0.4) (0.2)
Less: Tax effect 0.0 0.1 0.1 0.1
Net income (loss) attributable to Scholastic Corporation $ 0.0 $ 0.1 $ 0.1 $ 0.2