Acquisitions (Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($)			5 Months Ended
	Jul. 31, 2021	Mar. 02, 2021	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Preliminary allocation of aggregate purchase price:
Goodwill	$ 347,698,000		$ 347,698,000	$ 330,519,000
UHP
Business Acquisition [Line Items]
Initial upfront payment	23,979,000	$ 23,902,000	23,979,000
Hold back amount	4,991,000	5,000,000	4,991,000
Contingent earn-out consideration	8,500,000	8,500,000	8,500,000	$ 0	$ 0
Aggregate purchase price	37,470,000	37,402,000
Preliminary allocation of aggregate purchase price:
Cash and cash equivalents	1,391,000	1,391,000	1,391,000
Current assets	1,358,000	1,235,000	1,358,000
Property, plant and equipment	10,000	10,000	10,000
Deferred tax assets	313,000	286,000	313,000
Contract liabilities	(648,000)	(657,000)	(648,000)
Accrued warranty obligations	(750,000)	(750,000)	(750,000)
Other current liabilities	(1,175,000)	(1,166,000)	(1,175,000)
Non-current liabilities	(160,000)	(160,000)	(160,000)
Net tangible assets at preliminary fair value	339,000	189,000	339,000
Deferred tax liabilities	(8,374,000)	(8,374,000)	(8,374,000)
Goodwill	13,905,000	13,987,000	13,905,000
Preliminary allocation of aggregate purchase price	37,470,000	37,402,000	37,470,000
Measurement Period Adjustments
Initial upfront payment			77,000
Hold back amount			(9,000)
Current assets			123,000
Deferred tax assets			27,000
Contract liabilities			9,000
Other current liabilities			(9,000)
Net tangible assets at preliminary fair value			150,000
Goodwill			(82,000)
Preliminary allocation of aggregate purchase price			68,000
UHP | Technology
Preliminary allocation of aggregate purchase price:
Identifiable intangible assets	15,300,000	$ 15,300,000	15,300,000
Measurement Period Adjustments
Estimated Useful Lives		15 years
UHP | Customer relationships
Preliminary allocation of aggregate purchase price:
Identifiable intangible assets	15,500,000	$ 15,500,000	15,500,000
Measurement Period Adjustments
Estimated Useful Lives		15 years
UHP | Trade name
Preliminary allocation of aggregate purchase price:
Identifiable intangible assets	$ 800,000	$ 800,000	$ 800,000
Measurement Period Adjustments
Estimated Useful Lives		20 years