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Taxes - Schedule for components for deferred income taxes (Details) - USD ($)
$ in Millions
May 31, 2025
May 31, 2024
Deferred tax assets:    
Tax uniform capitalization $ 12.2 $ 8.9
Prepublication expenses 3.0 2.0
Inventory reserves 21.8 22.7
Allowance for credit losses 1.8 1.8
Deferred revenue 6.2 5.7
Stock based compensation 5.9 4.8
Other reserves 4.4 5.4
Postretirement, post employment and pension obligations 1.6 1.9
Tax carryforwards 32.4 30.1
Lease liabilities 27.7 28.7
Other 15.0 15.9
Gross deferred tax assets 132.0 127.9
Valuation allowance (17.1) (19.9)
Total deferred tax assets 114.9 108.0
Deferred tax liabilities:    
Depreciation and amortization (53.9) (41.1)
Lease right-of-use assets (24.4) (25.5)
Research and development costs capitalized (8.3) (14.2)
Other (3.7) (4.1)
Total deferred tax liability (90.3) (84.9)
Total net deferred tax assets 24.6 $ 23.1
Foreign jurisdictions unable to be netted $ 10.1