Revenues - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 31, 2019
Revenue from Contract with Customer [Abstract]
Returns liability	$ 43.5	$ 34.5
Returns asset	2.7	1.6
Deferred revenue	$ 121.8	$ 107.2

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration