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Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended		64 Months Ended
	Jul. 31, 2015	Jan. 31, 2017	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2017	Dec. 30, 2015	Jul. 09, 2015	Sep. 22, 2011
Common stock authorized for repurchase (in shares)							13,888,888
Remittance to taxing authorities under statutory withholding		$ 134.6
Number of stock options exercised		9,892,000
Stock Repurchase Program 2011
Stock Repurchase Program Additional Number Of Shares Authorized Approved								40,000,000
Stock Repurchased and Retired During Period, Shares					53,456,801
Number of shares available for repurchase under stock repurchase program		44,543,199			44,543,199
Common Stock | Stock Repurchase Program 2011
Common stock authorized for repurchase (in shares)								98,000,000
Common Stock | Dutch Auction
Common stock authorized for repurchase (in shares)						7,317,073
Stock Repurchased and Retired During Period, Shares	6,254,061		8,333,333
Stock Repurchased and Retired During Period Cost Per Share						$ 39.00
Common Shares Purchased Under Tender Offer, Value			$ 325.0	$ 225.1
Maximum | Common Stock | Dutch Auction
Purchase Price Per Share Of Common Shares Purchased Under Tender Offer							$ 36.00
Stock Repurchase Program, Share Offer Price						41.00
Minimum | Common Stock | Dutch Auction
Purchase Price Per Share Of Common Shares Purchased Under Tender Offer							$ 34.75
Stock Repurchase Program, Share Offer Price						$ 38.00

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The number additional shares approved under company's stock repurchase program by the entity's board of directors.

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Represents the price per share paid to acquire company's common stock under stock repurchase program.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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