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Senior Notes - Summary of Senior Notes (Detail) - USD ($)
$ in Thousands
Jul. 14, 2010
May. 07, 2008
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]        
Amount     $ 516,000 $ 376,000
Series A        
Debt Instrument [Line Items]        
Amount   $ 41,000    
Interest Rate   6.37%    
Maturity Date   May 07, 2013    
Series B        
Debt Instrument [Line Items]        
Amount   $ 40,000    
Interest Rate   6.37%    
Maturity Date   May 07, 2015    
Series C        
Debt Instrument [Line Items]        
Amount   $ 63,000    
Interest Rate   6.71%    
Maturity Date   May 07, 2015    
Series D        
Debt Instrument [Line Items]        
Amount   $ 131,000    
Interest Rate   7.18%    
Maturity Date   May 07, 2018    
Series E        
Debt Instrument [Line Items]        
Amount $ 60,000      
Interest Rate 4.72%      
Maturity Date Jul. 14, 2016      
Series F        
Debt Instrument [Line Items]        
Amount $ 72,000      
Interest Rate 5.04%      
Maturity Date Jul. 14, 2017      
Series G        
Debt Instrument [Line Items]        
Amount $ 28,000      
Interest Rate 5.42%      
Maturity Date Jul. 14, 2019      
Series H        
Debt Instrument [Line Items]        
Amount $ 85,000      
Interest Rate 5.59%      
Maturity Date Jul. 14, 2020