Goodwill and Other Intangible Assets (Reconciliation of Goodwill) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0	$ 0
Goodwill [Roll Forward]
Beginning Balance	238,400,000	238,100,000
Goodwill acquired	72,900,000	600,000
Foreign exchange translation	(8,200,000)	(300,000)
Ending Balance	303,100,000	238,400,000
Engine Products
Goodwill [Roll Forward]
Beginning Balance	84,900,000	84,300,000
Goodwill acquired	0	600,000
Foreign exchange translation	(400,000)	0
Ending Balance	84,500,000	84,900,000
Industrial Products
Goodwill [Roll Forward]
Beginning Balance	153,500,000	153,800,000
Goodwill acquired	72,900,000	0
Foreign exchange translation	(7,800,000)	(300,000)
Ending Balance	$ 218,600,000	$ 153,500,000