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Acquisitions (Narrative) (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 26, 2017
USD ($)
Feb. 05, 2016
USD ($)
Sep. 03, 2014
USD ($)
brand
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Apr. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Business Acquisition [Line Items]                        
Additions to goodwill               $ 268,577,000 $ 76,834,000 $ 104,478,000    
Goodwill         $ 615,252,000     $ 615,252,000 $ 360,191,000 $ 290,651,000   $ 190,911,000
C.B. Fleet Company, Inc.                        
Business Acquisition [Line Items]                        
Purchase price $ 823,700,000                      
Indefinite-lived intangible assets 648,700,000                      
Finite-lived intangible assets $ 98,900,000                      
Purchased amortizable intangible assets, weighted average useful life 18 years 8 months 12 days                      
Finite-lived intangible assets, weighted average remaining period 18 years 7 months 6 days                      
Goodwill, post-closing inventory and apportionment adjustment $ 268,600,000                      
Pro forma revenue since acquisition         38,700,000              
Pro Forma loss since acquisition         $ 2,500,000              
Goodwill 268,577,000                      
Intangible assets, net 747,600,000                      
DenTek Oral Care, Inc.                        
Business Acquisition [Line Items]                        
Purchase price   $ 226,900,000                    
Indefinite-lived intangible assets   179,800,000                    
Finite-lived intangible assets   $ 26,900,000                    
Purchased amortizable intangible assets, weighted average useful life   18 years 6 months 12 days                    
Goodwill, post-closing inventory and apportionment adjustment       $ (2,800,000)                
Additions to goodwill       $ 73,700,000                
Goodwill   $ 73,737,000                    
Intangible assets, net   $ 206,700,000                    
Insight Pharmaceuticals Corporation                        
Business Acquisition [Line Items]                        
Indefinite-lived intangible assets     $ 599,600,000                  
Finite-lived intangible assets     $ 124,800,000                  
Purchased amortizable intangible assets, weighted average useful life     16 years 2 months 12 days                  
Goodwill, post-closing inventory and apportionment adjustment           $ (7,200,000) $ 300,000          
Purchase price, gross     $ 745,900,000                  
Number of brands acquired | brand     27                  
Number of brands sold | brand     1                  
Goodwill     $ 96,323,000                  
Assets sold on acquisition date, not included in consideration transferred     18,500,000                  
Intangible assets, net     724,374,000                  
Insight Pharmaceuticals Corporation | Intangible assets                        
Business Acquisition [Line Items]                        
Assets sold on acquisition date, not included in consideration transferred     17,700,000                  
Insight Pharmaceuticals Corporation | Inventory                        
Business Acquisition [Line Items]                        
Assets sold on acquisition date, not included in consideration transferred     600,000                  
Insight Pharmaceuticals Corporation | Property, plant and equipment                        
Business Acquisition [Line Items]                        
Assets sold on acquisition date, not included in consideration transferred     $ 200,000                  
Hydralyte                        
Business Acquisition [Line Items]                        
Goodwill                     $ 1,224,000  
Intangible assets, net                     $ 73,580,000  
Term Loans | C.B. Fleet Company, Inc.                        
Business Acquisition [Line Items]                        
Debt instrument, face amount $ 740,000,000