CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (24.4)	$ (39.8)
Other comprehensive income (loss), net:
Foreign currency translation adjustment	(5.8)	10.7
Pension and postretirement adjustments (net of tax)	0.1	0.1
Total other comprehensive income (loss), net	(5.7)	10.8
Comprehensive income (loss)	(30.1)	(29.0)
Less: Net income (loss) attributable to noncontrolling interest	(0.2)	0.0
Comprehensive income (loss) attributable to Scholastic Corporation	$ (29.9)	$ (29.0)