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Taxes (Details) - Schedule for components for deferred income taxes - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
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Deferred tax assets |  |
Tax uniform capitalization | $ 19.4 | $ 17.0
Prepublication expenses | 13.2 | 13.1
Inventory reserves | 25.1 | 27.2
Allowance for doubtful accounts | 4.2 | 3.9
Other reserves | 26.3 | 27.0
Post-retirement, post-employment and pension obligations | 15.9 | 15.6
Tax carryforwards | 32.2 | 29.5
Lease accounting | (0.4) | (0.4)
Other - net | 12.0 | 25.0
Gross deferred tax assets | 147.9 | 157.9
Valuation allowance | (28.4) | (28.3)
Total deferred tax assets | 119.5 | 129.6
Deferred tax liabilities |  |
Prepaid expenses | (0.6) | (0.9)
Depreciation and amortization | (50.4) | (41.2)
Total deferred tax liability | (51.0) | (42.1)
Total net deferred tax assets | $ 68.5 | $ 87.5

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