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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended			58 Months Ended
	Jul. 31, 2015	Apr. 30, 2016	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2016	Dec. 30, 2015	Jul. 09, 2015	Sep. 22, 2011
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)									40,000,000
Common stock authorized for repurchase (in shares)								13,888,888
Remittance to taxing authorities under statutory withholding in fiscal year 2013, 2012 and 2011			$ 15.0	$ 3.8	$ 0.1
Stock Repurchase Program 2011 [Member]
Stock Repurchase [Abstract]
Common stock authorized for repurchase (in shares)									98,000,000
Company repurchased common stock (in shares)			2,938,519	231,500		53,456,801
Company repurchased common stock			$ 117.9	$ 8.3
Shares remaining available for repurchase			44,543,199			44,543,199
Common Stock [Member] | Stock Repurchase Program 2011 [Member]
Stock Repurchase [Abstract]
Stock repurchase price per share (in dollars per share)			$ 40.13		$ 36.02	$ 40.13
Common Stock [Member] | Dutch Auction [Member]
Stock Repurchase [Abstract]
Common stock authorized for repurchase (in shares)							7,317,073
Company repurchased common stock (in shares)	6,254,061	8,333,333
Stock repurchase price per share (in dollars per share)							$ 39.00
Common Shares Purchased Under Tender Offer, Value		$ 325.0		$ 225.1
Common Stock [Member] | Dutch Auction [Member] | Maximum
Stock Repurchase [Abstract]
Stock Repurchase Program, Share Offer Price							41.00
Tender price to purchase common shares								$ 36.00
Common Stock [Member] | Dutch Auction [Member] | Minimum
Stock Repurchase [Abstract]
Stock Repurchase Program, Share Offer Price							$ 38.00
Tender price to purchase common shares								$ 34.75

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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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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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