Segment Reporting (Summary Of Segment Detail) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 701.4	$ 644.8
Earnings before income taxes	96.4	84.7
Engine Products segment
Segment Reporting Information [Line Items]
Net sales	480.9	442.1
Industrial Products segment
Segment Reporting Information [Line Items]
Net sales	220.5	202.7
Operating Segments | Engine Products segment
Segment Reporting Information [Line Items]
Earnings before income taxes	63.9	62.7
Operating Segments | Industrial Products segment
Segment Reporting Information [Line Items]
Earnings before income taxes	36.6	29.4
Corporate, Non-Segment | Corporate and Unallocated
Segment Reporting Information [Line Items]
Earnings before income taxes	$ (4.1)	$ (7.4)