Debt (Schedule Of Leverage Ratios And Applicable Margins) (Details)	3 Months Ended
	Oct. 31, 2016
Range 1 [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Applicable Margin for Prime Rate Loans	1.50%
Range 2 [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Applicable Margin for Prime Rate Loans	1.00%
Range 3 [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Applicable Margin for Prime Rate Loans	0.50%
Minimum [Member] | Range 1 [Member]
Debt Instrument [Line Items]
Total Leverage Ratio	2.50
Minimum [Member] | Range 2 [Member]
Debt Instrument [Line Items]
Total Leverage Ratio	1.75
Maximum [Member] | Range 2 [Member]
Debt Instrument [Line Items]
Total Leverage Ratio	2.50
Maximum [Member] | Range 3 [Member]
Debt Instrument [Line Items]
Total Leverage Ratio	1.75