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Business Combinations, Dispositions and Other Strategic Investments - Consideration Paid for Hi-Tech (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 17, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 27, 2013
Business Acquisition [Line Items]                                            
Acquisition related expense   $ 129,000 $ 230,000 $ 225,000 $ 1,257,000 $ 3,287,000 $ 8,159,000 $ 20,940,000 $ 454,000 $ 934,000 $ 1,459,000 $ 519,000 $ 1,482,000 $ 21,394,000 $ 519,000 $ 1,712,000 $ 29,553,000 $ 1,978,000 $ 1,841,000 $ 32,840,000 $ 2,912,000  
Goodwill   284,710,000 $ 284,708,000 $ 285,356,000 $ 285,674,000 $ 285,283,000 $ 285,881,000 $ 186,365,000 $ 30,437,000 $ 29,831,000     $ 285,356,000 $ 186,365,000   $ 284,708,000 $ 285,881,000   284,710,000 285,283,000 29,831,000  
Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Consideration paid $ 649,600,000                                          
Price per share $ 43.50                                          
Payment of stock options $ 44,600,000                                          
Common stock par value per share                                           $ 0.01
Debt Instrument, Face Amount 600,000,000                                          
Acquisition related expense                                     800,000 21,300,000 $ 1,600,000  
Cash and cash equivalents 89,700,000                                          
Accounts receivable 48,600,000                                          
Inventory 52,400,000                                          
Other current assets 34,000,000                                          
Property and equipment 45,200,000                                          
Goodwill 171,300,000                                          
Other non-current assets 600,000                                          
Total assets acquired 796,600,000                                          
Assumed current liabilities (22,600,000)                                          
Assumed non-current liabilities (3,300,000)                                          
Deferred tax liabilities (121,100,000)                                          
Total liabilities assumed (147,000,000)                                          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 649,600,000                                          
Goodwill and other intangible assets expected to be deducted for tax purposes in future periods   $ 18,900,000                                 18,900,000      
Net revenue recorded since acquisition                                     $ 324,500,000 $ 150,700,000    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                                     15 years 7 months 6 days      
Cash Paid to Hi-Tech Stockholders [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Consideration paid 605,000,000                                          
Cash Paid to Vested Hi-Tech Option Holders [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Consideration paid 40,500,000                                          
Cash Paid to Key Executives [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Consideration paid 4,100,000                                          
Product Licensing Rights [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Intangible assets 339,600,000                                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                                     15 years 8 months 12 days      
IPR&D [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Intangible assets 9,400,000                                          
Customer Relationships [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Intangible assets 300,000                                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                                     1 year      
Trademarks [Member] | Hi-Tech Pharmacal Co., Inc [Member]                                            
Business Acquisition [Line Items]                                            
Intangible assets $ 5,500,000                                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                                     9 years