Sale of Subsidiary - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended
Feb. 28, 2020	Mar. 31, 2020
Disposal of Subsidiary [Line Items]
Pre-tax net gain on sale		$ 1.0
Clinic Asset Group [Member]
Disposal of Subsidiary [Line Items]
Pre-tax net gain on sale	$ 1.0
Pre-tax gain by settlement	1.2
Offset by a loss, due to the difference between the purchase price and net assets	$ 0.2

Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

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