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Acquisitions (Details) $ in Millions		12 Months Ended
	Mar. 27, 2019 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($) business	Mar. 26, 2019 USD ($)	May 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 125.2	$ 119.2		$ 118.9
Intangible assets acquired		$ 4.5	$ 3.3
Make Believe Ideas Limited (MBI) [Member]
Business Acquisition [Line Items]
Additional equity interest acquired	46.50%
Ownership percentage	95.00%	100.00%		48.50%
Fair value of equity method investment	$ 4.6	$ 22.3		$ 12.1
Goodwill	6.3
Consideration transferred	7.6
Pre-acquisition payable	3.0
Fair value of equity method investment, increase (decrease)	$ 0.1
Future operating cash flows projections, discount rate	17.00%
Foreign currency translation adjustment, income (loss)	$ (1.0)
Noncontrolling ownership percentage	5.00%
Retained interest	$ 1.3
U.S. Based Book Fair Business and U.K. Based Book Business [Member]
Business Acquisition [Line Items]
Intangible assets acquired		0.6
U.S. Based Book Fair Business [Member]
Business Acquisition [Line Items]
Number of businesses acquired | business			2
Intangible assets acquired		0.3	$ 1.8
U.K. Based Book Business [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 0.3	$ 1.5
Trade Names [Member] | Make Believe Ideas Limited (MBI) [Member]
Business Acquisition [Line Items]
Trade name	$ 3.9

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