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Stock Repurchase Program Stock Repurchase Activities (Phantom) (Details) $ in Millions	6 Months Ended
	Jan. 31, 2016 USD ($)
Accelerated Share Repurchase Program August 2015 [Member] | Scenario, Forecast [Member]
Share Repurchases [Line Items]
Settlement of equity forward contract	$ 20.0

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- Definition

Accelerated Share Repurchases, Remaining Agreement Amount

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- Definition

Share Repurchases [Line Items]

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No definition available.

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- Details

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- Details

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