Acquisitions (Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($)			3 Months Ended	6 Months Ended
	Oct. 31, 2020	Jan. 27, 2020	Jan. 31, 2021	Jan. 31, 2021	Jul. 31, 2020
Allocation of aggregate purchase price:
Goodwill			$ 333,793,000	$ 333,793,000	$ 330,519,000
Measurement Period Adjustments
Goodwill				2,222,000
CGC
Business Acquisition [Line Items]
Paid in cash	$ 12,075,000	$ 12,075,000	12,075,000
Paid in common stock	11,575,000	11,575,000	11,575,000
Purchase price at fair value	23,650,000	23,650,000	23,650,000
Allocation of aggregate purchase price:
Cash and cash equivalents	160,000	$ 160,000	160,000	160,000
Current assets	5,005,000		5,005,000	5,005,000
Property, plant and equipment	697,000		818,000	818,000
Operating lease assets	924,000		924,000	924,000
Deferred tax assets, non-current	470,000		517,000	517,000
Non-current assets	89,000		89,000	89,000
Contract liabilities	(6,890,000)		(6,890,000)	(6,890,000)
Accrued warranty obligations	(1,000,000)		(1,500,000)	(1,500,000)
Other current liabilities	(3,104,000)		(3,104,000)	(3,104,000)
Non-current liabilities	(1,327,000)		(1,327,000)	(1,327,000)
Net tangible liabilities at fair value	(4,976,000)		(5,308,000)	(5,308,000)
Other intangible liabilities	0		(2,500,000)	(2,500,000)
Deferred tax liabilities	(2,984,000)		(2,558,000)	(2,558,000)
Goodwill	15,810,000		18,116,000	18,116,000
Allocation of aggregate purchase price	23,650,000		23,650,000	23,650,000
Measurement Period Adjustments
Property, plant and equipment			121,000
Deferred tax assets, non-current			47,000
Accrued warranty obligations			(500,000)
Net tangible liabilities at fair value			(332,000)
Other intangible liabilities			(2,500,000)
Deferred tax liabilities			426,000
Goodwill			2,306,000
Allocation of aggregate purchase price			$ 0
Estimated Useful Lives			1 year 6 months
CGC | Technology
Allocation of aggregate purchase price:
Identifiable intangible assets	6,700,000		$ 7,000,000	7,000,000
Measurement Period Adjustments
Identifiable intangible assets			$ 300,000
Estimated Useful Lives			20 years
CGC | Customer relationships
Allocation of aggregate purchase price:
Identifiable intangible assets	8,100,000		$ 7,800,000	7,800,000
Measurement Period Adjustments
Identifiable intangible assets			$ (300,000)
Estimated Useful Lives			19 years
CGC | Trade name
Allocation of aggregate purchase price:
Identifiable intangible assets	$ 1,000,000		$ 1,100,000	$ 1,100,000
Measurement Period Adjustments
Identifiable intangible assets			$ 100,000
Estimated Useful Lives			5 years