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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Asset impairment charges $ 18,070   $ 54,070 $ 7,400
Tax benefits expected to be realized on asset impairment charges     19,900  
Income tax expense (benefit) $ 7,387 $ 5,354 $ (5,388) $ 5,724
Income tax expense (benefit) as a percent of income before income taxes 45.30% 15.90% (57.20%) 10.80%
Amount of additional tax expense due to a change in the recognition of tax benefits from impairment charges $ 6,500      
Tax benefit (expense) associated with impairment charges     $ 6,400  
Tax benefits to be recognized in future periods     13,500  
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation     2,600 $ 1,300
Tax benefit recorded related to the resolution of an uncertain tax position 2,200 $ 0 2,800 1,400
Nutritional Supplements        
Asset impairment charges $ 18,070   $ 50,070 $ 5,000