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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 8 Months Ended 9 Months Ended 9 Months Ended
Nov. 01, 2013
Jun. 12, 2013
Sep. 27, 2013
Nov. 01, 2013
Oct. 31, 2012
Jun. 11, 2013
Closing Price
Jun. 12, 2013
Opening Price
Nov. 01, 2013
Vesting Stock Awards
Nov. 01, 2013
Vesting Stock Awards
Required Service Conditions and Performance Conditions
Nov. 01, 2013
Stock Options
Oct. 31, 2012
Stock Options
Nov. 01, 2013
Outside Directors
Oct. 31, 2012
Outside Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expected term 5 years   5 years   5 years         7 years 7 years    
Vesting period       3 years       4 years 7 years 4 years 4 years 1 year 1 year
Incremental share factor   1.0713                      
Share price           $ 59.48 $ 55.52            
Decrease in share factor   0.9334                      
Fair value of vesting awards that vested       $ 57 $ 64                
Maximum percentage that will ultimately be awarded       150.00%