Business Combinations (The Merger - Summary of Information Related to Acquisition) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 10, 2020	Mar. 31, 2021	Jun. 01, 2020	Mar. 31, 2020	Jun. 26, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Cash			$ 755
Accounts receivable, net of allowance of $22,059			5,739
Prepaid expenses and other current assets			2,251
Property and equipment, net			840
Goodwill		$ 4,108,792	98,830	$ 3,795,325
Other noncurrent assets			690
Accounts payable			(3,882)
Deferred revenue, current			(2,946)
Other long-term liabilities			(222)
Total consideration transferred			198,291
Common Stock, par value		$ 0.001		$ 0.001	$ 0.001
The Merger [Member]
Business Acquisition [Line Items]
Cash	$ 330,665
Accounts receivable, net of allowance of $22,059	718,895
Contract assets	132,704
Prepaid expenses and other current assets	115,436
Investment in business purchase option	146,500
Property and equipment, net	206,751
Goodwill	4,363,282
Other noncurrent assets	169,539
Accounts payable	(60,637)
Accrued expenses	(563,791)
Deferred revenue, current	(292,528)
Current portion of long-term debt	(28,969)
Other current liabilities	(22,732)
Long-term debt, excluding current portion	(4,713,565)
Deferred income tax liabilities	(576,546)
Tax receivable agreement obligations due to related parties	(176,586)
Other long-term liabilities	(102,675)
Total consideration transferred	4,035,743
Accounts receivable, allownace for doubtful accounts	22,059
Fair value of shares issued to SpinCo shareholders (175,995,192 shares at $12.47 per share): Common Stock, $0.001 par value	176
Additional paid-in capital	2,194,484
Fair value of Joint Venture equity interest previously held	1,589,040
Fair value of Joint Venture equity interest previously held through TEUs	216,764
Settlement of dividend receivable	42,778
Repayment of advances to member	(7,499)
Purchase consideration	$ 4,035,743
Fair value of shares issued to SpinCo shareholders , shares	175,995,192
Fair value of shares issued to SpinCo shareholders, share price	$ 12.47
Common Stock, par value	$ 0.001
Customer Relationships [Member]
Business Acquisition [Line Items]
Identified intangible assets			74,300
Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful life		12 years
Customer Relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful life		18 years
Customer Relationships [Member] | The Merger [Member]
Business Acquisition [Line Items]
Identified intangible assets	$ 3,056,000
Customer Relationships [Member] | The Merger [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful life	12 years
Customer Relationships [Member] | The Merger [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful life	16 years
Tradenames [Member]
Business Acquisition [Line Items]
Useful life		18 years
Tradenames [Member] | The Merger [Member]
Business Acquisition [Line Items]
Identified intangible assets	$ 146,000
Useful life	18 years
Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Identified intangible assets			$ 25,300
Technology-Based Intangible Assets [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful life		6 years
Technology-Based Intangible Assets [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful life		12 years
Technology-Based Intangible Assets [Member] | The Merger [Member]
Business Acquisition [Line Items]
Identified intangible assets	$ 1,188,000
Technology-Based Intangible Assets [Member] | The Merger [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful life	6 years
Technology-Based Intangible Assets [Member] | The Merger [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful life	12 years