CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 35.2	$ 71.1	$ (4.6)	$ 12.6
Other comprehensive income (loss), net:
Foreign currency translation adjustment	0.4	3.9	11.1	1.9
Pension and postretirement adjustments (net of tax)	5.4	0.2	5.5	0.4
Total other comprehensive income (loss), net	5.8	4.1	16.6	2.3
Comprehensive income (loss)	41.0	75.2	12.0	14.9
Less: Net income (loss) attributable to noncontrolling interest	0.1	0.1	0.1	0.1
Comprehensive income (loss) attributable to Scholastic Corporation	$ 40.9	$ 75.1	$ 11.9	$ 14.8