v3.5.0.1
Basis of Presentation and Summary of Significant Accounting Policies (Details)
6 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Operating_segment
$ / shares
Sep. 25, 2015
USD ($)
$ / shares
May 02, 2016
USD ($)
$ / shares
Apr. 01, 2016
USD ($)
Common stock, par value | $ / shares $ 0.01 $ 0.01    
Fiscal Period Duration   364 days    
Number of operating segments | Operating_segment 2      
Prepaid Expense, Current $ 22,000,000 $ 15,000,000    
5.250% Note Due 2020 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage 5.25%      
6.250% Note due 2021 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage 6.25%      
3.500% Note due 2022 [Member] | Unsecured Debt [Member]        
Debt Instrument, Interest Rate, Stated Percentage 3.50%      
4.125% Note due 2023 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.125%      
4.875% Note due 2042 [Member] | Unsecured Debt [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.875%      
2.250% Note due 2017 [Member] | Unsecured Debt [Member]        
Debt Instrument, Interest Rate, Stated Percentage 2.25%      
Debt Instrument, Face Amount $ 750,000,000      
4.125% Notes due 2019 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.125%      
Debt Instrument, Face Amount $ 500,000,000      
Scenario, Forecast [Member] | Prime Security Services [Member]        
Business Acquisition, Share Price | $ / shares     $ 42.00  
Scenario, Forecast [Member] | 4.875% Note due 2032 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage     4.875%  
Subsequent Event [Member] | 2.250% Note due 2017 [Member] | Unsecured Debt [Member]        
Debt Instrument, Tender Received, Face Amount       $ 667,000,000
Debt Instrument, Tender Remaining, Face Amount       83,000,000
Subsequent Event [Member] | 4.125% Notes due 2019 [Member] | Senior Notes [Member]        
Debt Instrument, Tender Received, Face Amount       453,000,000
Debt Instrument, Tender Remaining, Face Amount       $ 47,000,000
Subsequent Event [Member] | 4.875% Note due 2032 [Member] | Senior Notes [Member]        
Exchange Note Issued, Face Value     $ 718,000,000  
Subsequent Event [Member] | 4.875% Note due 2032 [Member] | Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage     4.875%  
Exchange Note Outstanding, Face Value     $ 32,000,000