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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

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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