Revenues - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Feb. 28, 2019	Feb. 28, 2019	May 31, 2018	Feb. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 1,000,500,000	$ 1,000,500,000	$ 1,065,200,000	$ 1,019,600,000
Returns liability	97,300,000	97,300,000	0	$ 0
Return asset	13,200,000	13,200,000
Amount of revenue recognized included within deferred revenue balance	$ 28,300,000.0	$ 91,000,000.0
Adjustments due to adoption | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings			(46,500,000)
Returns liability			$ 28,300,000