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Goodwill (Schedule of Segment Goodwill) (Details) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Goodwill [Line Items]    
Goodwill $ 742,126,000 $ 815,428,000
Accumulated impairment loss (130,170,000) (195,330,000)
Goodwill [Roll Forward]    
Balance — March 31, 2018 620,098,000  
Goodwill (71,405,000)  
Accumulated impairment loss 65,160,000 0
Effects of foreign currency exchange rates (1,897,000)  
Balance - December 31, 2018 611,956,000 620,098,000
North American OTC Healthcare    
Goodwill [Line Items]    
Goodwill 711,104,000 711,104,000
Accumulated impairment loss (130,170,000) (130,170,000)
Goodwill [Roll Forward]    
Balance — March 31, 2018 580,934,000  
Goodwill 0  
Accumulated impairment loss 0  
Effects of foreign currency exchange rates 0  
Balance - December 31, 2018 580,934,000 580,934,000
International OTC Healthcare    
Goodwill [Line Items]    
Goodwill 31,022,000 32,919,000
Accumulated impairment loss 0 0
Goodwill [Roll Forward]    
Balance — March 31, 2018 32,919,000  
Goodwill 0  
Accumulated impairment loss 0  
Effects of foreign currency exchange rates (1,897,000)  
Balance - December 31, 2018 31,022,000 32,919,000
Household Cleaning    
Goodwill [Line Items]    
Goodwill 0 71,405,000
Accumulated impairment loss 0 (65,160,000)
Goodwill [Roll Forward]    
Balance — March 31, 2018 6,245,000  
Goodwill (71,405,000)  
Accumulated impairment loss 65,160,000  
Effects of foreign currency exchange rates 0  
Balance - December 31, 2018 $ 0 $ 6,245,000