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Business Acquisitions - ISG (Details) - USD ($)		2 Months Ended	12 Months Ended
	Feb. 23, 2021	Apr. 30, 2021	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Business Acquisition [Line Items]
Amortization expense			$ 6,469,000	$ 2,822,000	$ 357,000
Goodwill		$ 314,205,000	314,205,000	6,340,000
Intelligent Systems Group
Business Acquisition [Line Items]
Period of goodwill deduction	15 years
Total paid	$ 29,700,000
Contingent consideration paid	$ 6,000,000
Number of years to reach revenue targets	3 years
Revenue		1,724,000
Amortization expense		$ 474,000
Acquisition-related costs			954,000
Other assets	$ 217,000
Goodwill	19,254,000
Total assets acquired	35,371,000
Fair value of consideration transferred:
Cash	29,700,000
Holdback	150,000
Contingent consideration	5,521,000
Total	35,371,000
Supplemental Pro Forma Information (unaudited)
Revenue			406,444,000	379,627,000
Net income (loss)			$ 23,787,000	$ 39,025,000
Intelligent Systems Group | Technology
Business Acquisition [Line Items]
Intangible assets	11,400,000
Intelligent Systems Group | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 4,500,000

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The period for goodwill arising from a business combination that is expected to be deductible for tax purposes.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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