Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 31, 2019	Jun. 30, 2020	Mar. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 598,200	$ 597,819
IWT [Member]
Business Acquisition [Line Items]
Agreement and Plan of Merger date	Jul. 31, 2019	Jul. 31, 2019
Total fair value of consideration transferred	$ 1,147,200
Amount payable to acquire	6,000
Amount receivable from acquire	6,600
Goodwill	495,800
Deferred tax liabilities	132,400
Step up of GAAP basis for fair market valuations	82,300
Deferred tax liabilities, acquired	50,100
Transaction costs related to Acquisition			$ 22,900
Estimates transaction cost including tax		$ 7,300
Intangible assets	$ 575,000
IWT [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible asset, useful life	20 years
IWT [Member] | Patents and Developed Technology [Member]
Business Acquisition [Line Items]
Intangible asset, useful life	10 years
IWT [Member] | Tradename and Trademarks [Member]
Business Acquisition [Line Items]
Intangible asset, useful life	20 years
IWT [Member] | Finite-Lived Intangible Assets
Business Acquisition [Line Items]
Step up of GAAP basis for fair market valuations	$ 80,200
IWT [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business combination measurement period	1 year