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Intangible Assets (Intangible Assets with Finite Lives) (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Apr. 30, 2021	Jul. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 449,933,000		$ 449,933,000			$ 449,933,000
Accumulated Amortization	191,932,000		191,932,000			181,234,000
Net Carrying Amount	258,001,000		258,001,000			268,699,000
Amortization of intangibles	5,349,000	$ 4,795,000	$ 10,698,000	$ 10,361,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period			20 years 2 months 12 days		20 years 2 months 12 days
Gross Carrying Amount	302,058,000		$ 302,058,000			302,058,000
Accumulated Amortization	100,357,000		100,357,000			93,215,000
Net Carrying Amount	201,701,000		$ 201,701,000			208,843,000
Technologies
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period			14 years 9 months 18 days		14 years 9 months 18 days
Gross Carrying Amount	114,949,000		$ 114,949,000			114,949,000
Accumulated Amortization	73,362,000		73,362,000			70,924,000
Net Carrying Amount	41,587,000		$ 41,587,000			44,025,000
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period			16 years 8 months 12 days		16 years 8 months 12 days
Gross Carrying Amount	32,926,000		$ 32,926,000			32,926,000
Accumulated Amortization	18,213,000		18,213,000			17,095,000
Net Carrying Amount	$ 14,713,000		$ 14,713,000			$ 15,831,000

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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