Business Combinations - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	3 Months Ended	7 Months Ended
	Oct. 31, 2019	Oct. 31, 2019	Oct. 31, 2020	Apr. 01, 2019	Oct. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 362,253	$ 362,253	$ 424,075		$ 225,290
Charles Machine Works, Inc
Business Acquisition [Line Items]
Cash and cash equivalents				$ 16,341
Receivables				65,674
Inventories				241,429
Prepaid expenses and other current assets				8,050
Property, plant and equipment				142,779
Goodwill				134,657
Other intangible assets:			$ 264,200	264,200
Other long-term assets				7,971
Accounts payable				(35,892)
Accrued liabilities				(51,943)
Deferred income tax liabilities				(85,277)
Other long-term liabilities				(6,665)
Total fair value of net assets acquired				701,314
Cash and cash equivalents				(16,341)
Total purchase price	$ 685,000	$ 684,973
Charles Machine Works, Inc | Trade names
Business Acquisition [Line Items]
Other intangible assets:				103,700
Charles Machine Works, Inc | Customer-related
Business Acquisition [Line Items]
Other intangible assets:				130,800
Charles Machine Works, Inc | Developed technology
Business Acquisition [Line Items]
Other intangible assets:				20,900
Charles Machine Works, Inc | Trade names
Business Acquisition [Line Items]
Other intangible assets:				5,200
Charles Machine Works, Inc | Backlog
Business Acquisition [Line Items]
Other intangible assets:				$ 3,590