|
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jan. 31, 2015
|
Jan. 31, 2014
|
Jan. 31, 2015
|
Jan. 31, 2014
|
|
| Income Taxes [Abstract] | ||||
| Effective tax rate | 27.00% | 22.10% | 27.30% | 27.60% |
| Tax benefit associated with the favorable settlement of a tax audit | $ 6.4 | |||
| Unrecognized tax benefits | 16.3 | 16.3 | ||
| Accrued interest and penalties on unrecognized tax benefits | 1.7 | 1.7 | ||
| Statute of limitations period, average, years | 5 years | |||
| Maximum possible reduction in amount of unrecognized tax benefits | $ 1.0 | |||
| Unrecognized tax benefits potential expiration period | 12 months | |||