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Acquisitions - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2023 USD ($) business shares	Jul. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)
Business Acquisition [Line Items]
Net tangible assets acquired					$ 186,600
Intangible assets					126,100
Goodwill					299,200
Cash payment for contingent consideration liabilities			$ 5,000	$ 1,600
Acquisitions 2023
Business Acquisition [Line Items]
Number of businesses acquired | business	3
Cash consideration	$ 463,500
Number of shares granted for acquired companies (in shares) | shares	1,018,946
Value of Quanta common stock issued	$ 123,500		123,503
Cash consideration			463,482
Intangible assets			113,020
Goodwill			286,598
Goodwill expected to be deductible for income tax			233,500		233,500
Revenues included in consolidated results of operations			93,500
Income (loss) before taxes			(16,100)
Amortization expense			8,600
Acquisition costs			17,800
Acquisitions 2022
Business Acquisition [Line Items]
Cash consideration		$ 22,300
Post-acquisition period, financial performance objectives		5 years
Acquisitions, Multiple Periods
Business Acquisition [Line Items]
Contingent consideration payments (up to)			$ 321,700		$ 321,700

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