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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 254,223 | $ 438,324 | $ 312,771
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income tax benefit | (3,446) | (71,068) | (21,237)
Provision for bad debts, net | 6,429 | 3,718 | 7,290
Unrealized (gains)/losses on investment securities | 3,680 | 4,228 | (99)
Non-cash lease expense | 26,609 | 31,508 | 22,756
Depreciation and amortization | 58,221 | 48,537 | 15,228
Contingent consideration valuation | 2,131 | 7,104 | 478
Compensation expense — equity and liability classified share awards (Note 14) | 156,936 | 91,875 | 62,421
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (37,742) | 14,128 | (32,965)
Unbilled work in progress | (11,596) | 18,036 | (78,526)
Unbilled work in progress | (25,958) | 14,895 | (11,579)
Accrued salaries and bonuses | (189,534) | 150,721 | 228,546
Accounts payable and accrued expenses and other | (32,014) | (9,955) | 535
Deferred income | (11,943) | (807) | (991)
Income taxes payable | (83,609) | (6,254) | 73,227
Net cash provided by operating activities | 136,273 | 736,604 | 579,837
Cash flows from investing activities: |  |  |
Purchases of investment securities | (19,230) | (101,562) | (391,555)
Sales or maturities of investment securities | 87,384 | 197,324 | 318,425
Acquisition of business, net of cash acquired | (20,427) | (360,996) | (12,470)
Purchase of property and equipment, net | (50,731) | (8,680) | (14,148)
Net cash used in investing activities | (3,004) | (273,914) | (99,748)
Cash flows from financing activities: |  |  |
Dividends paid | (140,384) | (114,806) | (92,006)
Share repurchases | (48,659) | (304,793) | (102,224)
Payments to settle employee tax obligations on share-based awards | (42,283) | (33,741) | (17,810)
Proceeds from issuance of Class A shares | 0 | 0 | 189,060
Earnouts paid | (6,679) | (5,917) | 0
Loans payable to former shareholders redeemed | (539) | (280) | (575)
Repayments of loans to non-affiliates | (2,488) | 0 | (3,601)
Other financing activities | 570 | 477 | 333
Net cash used in financing activities | (240,462) | (459,060) | (26,823)
Effects of exchange rate changes on cash and cash equivalents | (12,065) | (16,784) | 13,212
Net increase/(decrease) in cash, cash equivalents, and restricted cash | (119,258) | (13,154) | 466,478
Cash, cash equivalents and restricted cash – beginning of period | 834,070 | 847,224 | 380,746
Cash, cash equivalents and restricted cash – end of period | 714,812 | 834,070 | 847,224
Supplemental disclosures of non-cash activities: |  |  |
Shares issued via vesting of liability classified awards | 5,955 | 4,270 | 7,511
Shares issued as consideration for acquisitions | 7,238 | 2,000 | 1,050
Cash acquired through acquisitions | 11,933 | 244,162 | 88
Cash paid during the year: |  |  |
Interest | 5,904 | 1,000 | 989
Taxes, net of refunds | $ 156,786 | $ 242,031 | $ 44,202

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