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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
Feb. 28, 2015
Aug. 31, 2014
Dec. 27, 2014
Feb. 28, 2015
 [1]
August 2014 ASR        
Accelerated Share Repurchases [Line Items]        
Number of shares repurchased and retired 13,300 59,900 8,300 81,525
[1] 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.