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Taxes (Details) - Schedule for components for deferred income taxes - USD ($) $ in Millions | May 31, 2018 | May 31, 2017
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Deferred tax assets |  |
Tax uniform capitalization | $ 9.6 | $ 9.5
Prepublication expenses | 0.7 | 7.8
Inventory reserves | 15.0 | 24.6
Allowance for doubtful accounts | 2.2 | 3.3
Other reserves | 16.9 | 26.0
Postretirement, post employment and pension obligations | 7.1 | 12.5
Tax carryforwards | 26.9 | 24.1
Other - net | 13.7 | 14.8
Gross deferred tax assets | 92.1 | 122.6
Valuation allowance | (25.1) | (24.8)
Total deferred tax assets | 67.0 | 97.8
Deferred tax liabilities: |  |
Prepaid expenses | (0.4) | (0.4)
Depreciation and amortization | (41.4) | (43.7)
Total deferred tax liability | (41.8) | (44.1)
Total net deferred tax assets | $ 25.2 | $ 53.7

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