Acquisition - Fair value of assets acquired and liabilities (Details) - USD ($) $ in Millions	Mar. 20, 2023	May 31, 2023	May 31, 2022	May 31, 2021
Acquisition
Accounts receivable	$ 8.8
Other assets	6.7
Intangible assets	61.7
Deferred revenue	(6.8)
Deferred tax liabilities	(15.8)
Other liabilities	(2.6)
Net assets acquired	52.0
Goodwill	60.5	$ 175.8	$ 116.4	$ 119.3
Purchase price, net of cash acquired	112.5
Trax USA Corp | Tradenames
Acquisition
Acquired indefinite-lived intangible assets	6.1
Trax USA Corp | Customer relationships
Acquisition
Acquired amortizable intangible assets	$ 33.6
Amortization period of intangible assets (in years)	12 years
Trax USA Corp | Developed technology
Acquisition
Acquired amortizable intangible assets	$ 22.0
Amortization period of intangible assets (in years)	20 years