Asset Write Down (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Feb. 28, 2021 USD ($) fairs $ / shares	Feb. 28, 2021 USD ($) fairs $ / shares
Class of Stock [Line Items]
Asset impairment expense	$ 8.5	$ 2.4
Right of use assets	7.0
Other long lived assets	$ 1.5
Number of book fair closed | fairs	12	12
Number of book fairs total | fairs	54	54
Impairment expense on income (loss) per basic and diluted share	$ 10.9
Common Class A
Class of Stock [Line Items]
Impact on earnings per share (USD per share) | $ / shares	$ 0.23	$ 0.23