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Acquisitions (Narrative) (Details)
$ in Thousands
 2 Months Ended 3 Months Ended 12 Months Ended
Feb. 05, 2016
USD ($)
Sep. 03, 2014
USD ($)
brand
Jul. 01, 2013
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
Mar. 31, 2013
USD ($)
Business Acquisition [Line Items]                    
Finite-lived intangible assets, weighted average remaining period           14 years 4 months 24 days        
Additions to goodwill           $ 76,834 $ 104,478 $ 23,122    
Goodwill       $ 360,191   $ 360,191 $ 290,651 $ 190,911   $ 167,546
DenTek Oral Care, Inc.                    
Business Acquisition [Line Items]                    
Purchase price $ 228,300                  
Indefinite-lived intangible assets 179,800                  
Finite-lived intangible assets $ 26,900                  
Purchased amortizable intangible assets, weighted average useful life 18 years 6 months 12 days                  
Finite-lived intangible assets, weighted average remaining period 18 years 5 months 12 days                  
Additions to goodwill $ 76,500                  
Pro forma, revenue since acquisition date, actual       $ 10,700            
Goodwill 76,529                  
Intangible assets, net $ 206,700                  
Insight Pharmaceuticals Corporation                    
Business Acquisition [Line Items]                    
Indefinite-lived intangible assets   $ 599,600                
Finite-lived intangible assets   $ 124,800                
Purchased amortizable intangible assets, weighted average useful life   16 years 2 months 12 days                
Finite-lived intangible assets, weighted average remaining period           14 years 7 months        
Purchase price, gross   $ 745,900                
Goodwill, post-closing inventory and apportionment adjustment   $ 7,200     $ (300)          
Number of brands acquired | brand   27                
Number of brands sold | brand   1                
Goodwill   $ 96,323                
Assets sold on acquisition date, not included in consideration transferred   18,500                
Intangible assets, net   724,374                
Insight Pharmaceuticals Corporation | Intangible assets                    
Business Acquisition [Line Items]                    
Assets sold on acquisition date, not included in consideration transferred   17,700                
Insight Pharmaceuticals Corporation | Inventory                    
Business Acquisition [Line Items]                    
Assets sold on acquisition date, not included in consideration transferred   600                
Insight Pharmaceuticals Corporation | Property, plant and equipment                    
Business Acquisition [Line Items]                    
Assets sold on acquisition date, not included in consideration transferred   $ 200                
Hydralyte                    
Business Acquisition [Line Items]                    
Goodwill                 $ 1,224  
Intangible assets, net                 $ 73,580  
Care Pharma                    
Business Acquisition [Line Items]                    
Indefinite-lived intangible assets     $ 29,800              
Finite-lived intangible assets     $ 1,700              
Purchased amortizable intangible assets, weighted average useful life     15 years 1 month 6 days              
Finite-lived intangible assets, weighted average remaining period           12 years 5 months 18 days        
Goodwill     $ 23,122              
Intangible assets, net     $ 31,502