Goodwill and Other Intangible Assets (Reconciliation of Goodwill) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment		$ 0	$ 0	$ 0
Payment to acquire interest in joint venture	$ 7,500,000
Goodwill
Beginning Balance		316,800,000	303,100,000
Goodwill acquired	5,400,000	0	5,400,000
Currency translation		5,700,000	8,300,000
Ending Balance	316,800,000	322,500,000	316,800,000	303,100,000
Engine Products Segment
Goodwill
Beginning Balance		84,800,000	84,500,000
Goodwill acquired		0	0
Currency translation		(100,000)	300,000
Ending Balance	84,800,000	84,700,000	84,800,000	84,500,000
Industrial Products Segment
Goodwill
Beginning Balance		232,000,000.0	218,600,000
Goodwill acquired		0	5,400,000
Currency translation		5,800,000	8,000,000.0
Ending Balance	$ 232,000,000.0	$ 237,800,000	$ 232,000,000.0	$ 218,600,000