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Shareholders' Equity (Details 5) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009	Mar. 06, 2003
Equity [Abstract]
The aggregate intrinsic value of options exercised	$ 16.2	$ 19.0	$ 29.8
Unrecongnised total compensation cost related to non-vested stock-based awards	50.6
Amortized cost on a straight-line basis over a weighted average term	3.06
The fair value of options vested	$ 19.6	$ 19.6	$ 7.8
Series A Preferred Stock at an exercise price				$ 120.48
Minimum Percentage of Common Stock to be acquired to exercise the Right	15.00%
Minimum Percentage of Common Stock to be acquired through tender offer or exchange offer to exercise the Right	15.00%
Additional Permitted Common Stock Purchase in case of exercise of the Right	120.48
Percentage cost to acquire addional permitted common stock Purchase in case of exercise of the Right	50.00%
Redeemable value of right if any person or group acquires more than 15% of outstanding common stock	$ 0.001
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2011 (shares in 000's)	8,353
Weighted- Average Remaining Contractual Life	7.18
Weighted- Average Exercise Price	$ 31
Number Exercisable at July 31, 2011 (shares in 000's)	4,189
Weighted-Average Exercise Price (in dollars per share)	$ 28.67
Dollar 7.75 To 23.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2011 (shares in 000's)	517
Weighted- Average Remaining Contractual Life	2.17
Weighted- Average Exercise Price	$ 15.43
Number Exercisable at July 31, 2011 (shares in 000's)	517
Weighted-Average Exercise Price (in dollars per share)	$ 15.43
Dollar 24.03 To 29.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2011 (shares in 000's)	803
Weighted- Average Remaining Contractual Life	4.60
Weighted- Average Exercise Price	$ 25.22
Number Exercisable at July 31, 2011 (shares in 000's)	795
Weighted-Average Exercise Price (in dollars per share)	$ 25.18
Dollar 30.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2011 (shares in 000's)	4,000
Weighted- Average Remaining Contractual Life	7.71
Weighted- Average Exercise Price	$ 30.21
Number Exercisable at July 31, 2011 (shares in 000's)	1,800
Weighted-Average Exercise Price (in dollars per share)	$ 30.21
Doller 32.76 To 40.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2011 (shares in 000's)	3,033
Weighted- Average Remaining Contractual Life	8.01
Weighted- Average Exercise Price	$ 36.20
Number Exercisable at July 31, 2011 (shares in 000's)	1,077
Weighted-Average Exercise Price (in dollars per share)	$ 34.95

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The Rights may be redeemed by the Company at $0.001 per Right at any time before any person or group acquires 15% or more of our outstanding common stock.

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The Company's Board of Directors declared a dividend of one right (a Right) to purchase one-thousandth share of the Company's Series A Participating Preferred Stock for each outstanding share of Common Stock of the Company. Each Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series A Preferred Stock

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The Amount of Share-based Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Total Fair Value.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

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