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Income Taxes (Details)	9 Months Ended
Income Taxes (Details)	Apr. 30, 2013	Apr. 30, 2012
Income Taxes
Consolidated effective tax rate (as a percent)	35.40%	36.70%
United States
Income Taxes
Consolidated effective tax rate (as a percent)	36.40%	37.50%
Percentage of income before income taxes	96.00%	97.00%
Canada, Singapore and Netherlands
Income Taxes
Consolidated effective tax rate (as a percent)	10.10%	12.50%
Percentage of income before income taxes	4.00%	3.00%
Number of locations with lower statutory income tax rates compared to the United States	3	3

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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