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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:      
Net income $ 438,324 $ 312,771 $ 183,793
Adjustments to reconcile net income to net cash provided by operating activities:      
Deferred income tax benefit (71,068) (21,237) (9,654)
Provision for bad debts, net 3,718 7,290 4,873
Unrealized (gains)/losses on investment securities 4,228 (99) (75)
Non-cash lease expense 31,508 22,756 24,654
Depreciation and amortization 48,537 15,228 17,291
Contingent consideration valuation 7,104 478 (1,220)
Compensation expense — equity and liability classified share awards (Note 14) 91,875 62,421 64,345
Changes in operating assets and liabilities:      
Accounts receivable 14,128 (32,965) (13,387)
Unbilled work in progress 18,036 (78,526) 32,423
Unbilled work in progress 14,895 (11,579) (4,515)
Accrued salaries and bonuses 150,721 228,546 11,351
Accounts payable and accrued expenses and other (9,955) 535 (8,709)
Deferred income (807) (991) 1,058
Income taxes payable (6,254) 73,227 (12,443)
Net cash provided by operating activities 736,604 579,837 287,669
Cash flows from investing activities:      
Purchases of investment securities (101,562) (391,555) (350,679)
Sales or maturities of investment securities 197,324 318,425 340,624
Acquisition of business, net of cash acquired (360,996) (12,470) (2,197)
Receivables from affiliates 0 0 (170)
Purchase of property and equipment, net (8,680) (14,148) (20,722)
Net cash used in investing activities (273,914) (99,748) (33,144)
Cash flows from financing activities:      
Dividends paid (114,806) (92,006) (80,655)
Share repurchases (304,793) (102,224) (29,641)
Payments to settle employee tax obligations on share-based awards (33,741) (17,810) (31,477)
Proceeds from issuance of Class A shares 0 189,060 0
Earnouts paid (5,917) 0 0
Loans payable to former shareholders redeemed (280) (575) (654)
Repayments of loans to non-affiliates 0 (3,601) (10,081)
Other financing activities 477 333 369
Net cash used in financing activities (459,060) (26,823) (152,139)
Effects of exchange rate changes on cash and cash equivalents (16,784) 13,212 (7,755)
Net increase/(decrease) in cash, cash equivalents, and restricted cash (13,154) 466,478 94,631
Cash, cash equivalents and restricted cash – beginning of period 847,224 380,746 286,115
Cash, cash equivalents and restricted cash – end of period 834,070 847,224 380,746
Supplemental disclosures of non-cash activities:      
Shares issued via vesting of liability classified awards 4,270 7,511 6,555
Shares issued as consideration for acquisitions 2,000 1,050 0
Cash acquired through acquisitions 244,162 88 15,755
Cash paid during the year:      
Interest 1,000 989 1,049
Taxes, net of refunds $ 242,031 $ 44,202 $ 73,881