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Related Party Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 21, 2015
Sep. 30, 2014
Mar. 18, 2014
Related Party Transaction [Line Items]              
Expenses related to Services Agreement $ 700,000 $ 1,500,000 $ 3,300,000 $ 4,400,000      
Long-term Debt $ 6,860,300,000   $ 6,860,300,000     $ 5,194,500,000  
Preferred Stock [Member] | HCP Stockholders [Member]              
Related Party Transaction [Line Items]              
Stock Issued During Period, Shares, Acquisitions     23        
Share Price             $ 11.00
Stock Issued During Period, Value, Acquisitions     $ 253,000,000        
Maximum [Member] | Leucadia [Member]              
Related Party Transaction [Line Items]              
Percentage Of Beneficial Ownership     27.50%        
Maximum [Member] | Leucadia [Member]              
Related Party Transaction [Line Items]              
Percentage Of Beneficial Ownership     4.90%        
Severance Cost, one time payments [Member]              
Related Party Transaction [Line Items]              
Severance Costs     $ 20,500,000        
Severance Cost, Accrued Bonus [Member]              
Related Party Transaction [Line Items]              
Severance Costs     16,500,000        
Severance Cost, Future Bonus [Member]              
Related Party Transaction [Line Items]              
Severance Costs     $ 3,300,000        
Bridge Loan [Member] | Jefferies [Member]              
Related Party Transaction [Line Items]              
Long-term Debt         $ 1,500