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Investments - Schedule of Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]      
Total asset-based loans $ 395.9 $ 818.8  
Allowance for Credit Losses on Asset Backed Securities [Roll Forward]      
Balance at beginning of year 7.2 5.2 $ 1.4
Provision for credit losses 129.5 2.0 3.8
Balance at end of year 60.1 7.2 $ 5.2
Pass [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total asset-based loans 131.9 195.3  
Special Mention [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total asset-based loans 40.7 372.7  
Substandard [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total asset-based loans 97.8 $ 250.8  
Doubtful [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total asset-based loans 125.5    
Radioshack [Member]      
Allowance for Credit Losses on Asset Backed Securities [Roll Forward]      
Provision for credit losses $ 24.8