Segment Reporting (Summary Of Segment Detail) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 538.0	$ 596.5
Net sales, percent change from prior period	(9.80%)
Earnings before income taxes	$ 53.4	77.3
Earnings before income taxes, percent change from prior period	(30.90%)
Operating Segments [Member] | Engine Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 346.6	390.7
Net sales, percent change from prior period	(11.30%)
Earnings before income taxes	$ 36.0	53.1
Earnings before income taxes, percent change from prior period	(32.20%)
Operating Segments [Member] | Industrial Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 191.4	205.8
Net sales, percent change from prior period	(7.00%)
Earnings before income taxes	$ 24.0	27.6
Earnings before income taxes, percent change from prior period	(13.00%)
Corporate, Non-Segment [Member] | Corporate & Unallocated [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes	$ (6.6)	$ (3.4)
Earnings before income taxes, percent change from prior period	0.00%