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Goodwill And Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Amortization expense | $ 16.3 | $ 13.5 | $ 14.7
Amortizable intangible assets fully amortization year | 2032 |  |
General and Administrative Expenses |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Impairment of intangible assets |  | 106.6 |
Pivot Leadership |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Tax deductible goodwill | $ 7.2 | $ 7.1 |
Acquired Companies |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Tax deductible goodwill | 34.9 |  |
Acquired Companies | IP |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangibles assets | $ 36.0 |  |
Weighted average useful life | 7 years |  |
Acquired Companies | Customer Relationships |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangibles assets | $ 6.2 |  |
Weighted average useful life | 10 years |  |
Acquired Companies | Trade Names |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangibles assets | $ 3.2 |  |
Weighted average useful life | 9 years |  |

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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=118932676&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 The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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