Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jul. 01, 2019
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating lease right-of-use assets	$ 64.5
Operating lease liability current	12.9
Operating lease liability noncurrent	55.9
ASU 2016-02
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating lease liability	78.8	$ 78.8
Operating lease right-of-use assets	$ 74.5	74.5
Operating lease liability current		13.1
Operating lease liability noncurrent		$ 65.7
Assurex [Member] | Assurex Canada Ltd [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Non controlling interest ownership percentage by parent	85.00%
Centre For Addiction And Mental Health [Member] | Assurex Canada Ltd [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Non controlling interest ownership percentage by noncontrolling owners	15.00%