Acquisitions (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jan. 31, 2016 |
Jan. 31, 2015 |
Jan. 31, 2016 |
Jan. 31, 2015 |
Aug. 31, 2015 |
|
| Business Acquisition [Line Items] | |||||
| Net sales | $ 517.2 | $ 588.5 | $ 1,055.2 | $ 1,185.0 | |
| Engine Products | |||||
| Business Acquisition [Line Items] | |||||
| Percentage of voting interest acquired | 100.00% | ||||
| Net sales | $ 9.0 | ||||