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Accelerated Share Repurchase Activity and Related Information (Parenthetical) (Detail) - shares
shares in Thousands
 1 Months Ended 3 Months Ended 7 Months Ended
Jul. 31, 2015
May. 31, 2015
Feb. 28, 2015
Aug. 31, 2014
Jul. 31, 2015
 [1]
Dec. 27, 2014
Feb. 28, 2015
 [2]
May 2015 ASR              
Accelerated Share Repurchases [Line Items]              
Number of shares repurchased and retired 10,000 38,300     48,293    
August 2014 ASR              
Accelerated Share Repurchases [Line Items]              
Number of shares repurchased and retired     13,300 59,900   8,300 81,525
[1] Includes 38.3 million shares delivered and retired at the beginning of the purchase period, which began in the third quarter of 2015 and 10.0 million shares delivered and retired at the end of the purchase period, which concluded in the fourth quarter of 2015.
[2] Includes 59.9 million shares delivered and retired at the beginning of the purchase period, which began in the fourth quarter of 2014, 8.3 million net shares delivered and retired in the first quarter of 2015 and 13.3 million shares delivered and retired at the end of the purchase period, which concluded in the second quarter of 2015.