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Business Acquisitions - Arcturus (Details) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 19, 2021	Oct. 30, 2021	Oct. 31, 2020	Oct. 30, 2021	Oct. 31, 2020	Jul. 31, 2021	Apr. 30, 2021
Fair value of assets acquired:
Goodwill		$ 335,888,000		$ 335,888,000			$ 314,205,000
Supplemental Pro Forma Information (unaudited)
Revenue			$ 116,123,000
Net income (loss)			$ 4,151,000
Arcturus UAV Inc.
Business Acquisitions
Total	$ 422,602,000
Cash on hand	150,218,000
Fair market value of shares issued	72,384,000
Amount of representation and warranty insurance coverage	40,000,000
Acquisition-related costs		108,000		1,492,000
Fair value of assets acquired:
Accounts receivable	6,050,000
Unbilled receivable	4,176,000
Inventories, net	21,701,000
Prepaid and other current assets	2,709,000
Property and equipment, net	38,739,000
Operating lease assets	11,429,000
Other assets	136,000
Goodwill	290,006,000
Total assets acquired	458,146,000
Fair value of liabilities assumed:
Accounts payable	3,085,000
Wages and related accruals	1,698,000
Customer advances	1,818,000
Other current liabilities	9,562,000
Operating lease liabilities	12,297,000
Other non-current liabilities	1,190,000
Deferred income taxes, net	5,869,000
Total liabilities assumed	35,519,000
Total identifiable net assets	422,627,000
Fair value of consideration transferred:
Cash consideration, net of cash acquired	350,243,000
Equity consideration	72,384,000
Total paid	422,627,000
Supplemental Pro Forma Information (unaudited)
Revenue					$ 228,960,000
Net income (loss)					$ 21,010,000
Arcturus UAV Inc. | Technology
Fair value of assets acquired:
Intangible assets	20,500,000
Arcturus UAV Inc. | Customer relationships
Fair value of assets acquired:
Intangible assets	62,700,000
Arcturus UAV Inc. | Adjustment Escrow
Business Acquisitions
Amount held in escrow	6,500,000	$ 6,500,000		6,500,000
Amount of post-closing adjustments						$ 509,000
Arcturus UAV Inc. | Indemnification Escrow
Business Acquisitions
Amount held in escrow	1,822,500
Term loans
Business Acquisitions
Fair market value of shares issued				50,000,000
Fair value of consideration transferred:
Equity consideration				$ 50,000,000
Term loans | Arcturus UAV Inc.
Business Acquisitions
Amount of loan	$ 200,000,000

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