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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Oct. 31, 2013	Oct. 31, 2012
Income Taxes
Consolidated effective tax rate (as a percent)	36.70%	37.60%
United States
Income Taxes
Consolidated effective tax rate (as a percent)	37.30%	37.90%
Percentage of income before income taxes	96.00%	98.00%
Canada, Singapore and Netherlands
Income Taxes
Consolidated effective tax rate (as a percent)	23.00%	21.50%
Percentage of income before income taxes	4.00%	2.00%
Number of locations with lower statutory income tax rates compared to the United States	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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