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DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Discontinued Operations Comparative Financial Results) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2016 | Feb. 22, 2015 | Feb. 28, 2016 | Feb. 22, 2015
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |
Net sales | $ 634.0 | $ 969.5 | $ 2,484.7 | $ 2,932.5
Net gain on sale of businesses | 0.0 | 0.0 | 0.0 | 627.3
Goodwill and long-lived asset impairment charges | (22.5) | (1,284.1) | (1,921.1) | (1,524.8)
Income from operations of discontinued operations before income taxes and equity method investment earnings | 62.1 | 21.9 | 167.6 | 55.7
Income (loss) before income taxes | 39.6 | (1,262.2) | (1,753.5) | (841.8)
Income tax expense (benefit) | 20.9 | (97.2) | (445.6) | 136.3
Income (loss) from discontinued operations, net of tax | $ 18.7 | $ (1,165.0) | $ (1,307.9) | $ (978.1)

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