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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Registered Shares | Additional Paid-in Capital | Treasury Shares | Retained Earnings | Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning of the period at Mar. 31, 2019 | $ 1,176,339 | $ 30,148 | $ 56,655 | $ (169,802) | $ 1,365,036 | $ (105,698) |  |
Beginning of the period (in shares) at Mar. 31, 2019 |  | 173,106 |  | 7,244 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Total comprehensive income | 232,009 |  |  |  | 235,803 | (3,794) |  |
Purchases of registered shares | (15,127) |  |  | $ (15,127) |  |  |  |
Purchase of registered shares (in shares) |  |  |  | 389 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights | 11,540 |  | 2,607 | $ 8,933 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights (in shares) |  |  |  | (604) |  |  |  |
Issuance of shares upon vesting of restricted stock units | (23,096) |  | (39,902) | $ 16,806 |  |  |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (1,128) |  |  |  |
Share-based compensation | 40,308 |  | 40,308 |  |  |  |  |
Cash dividends | (124,180) |  |  |  | (124,180) |  |  |
End of the period at Dec. 31, 2019 | 1,297,793 | $ 30,148 | 59,668 | $ (159,190) | 1,476,659 | (109,492) |  |
End of the period (in shares) at Dec. 31, 2019 |  | 173,106 |  | 5,901 |  |  |  |
Beginning of the period at Sep. 30, 2019 | 1,167,537 | $ 30,148 | 50,913 | $ (163,728) | 1,359,134 | (108,930) |  |
Beginning of the period (in shares) at Sep. 30, 2019 |  | 173,106 |  | 6,203 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Total comprehensive income | 116,963 |  |  |  | 117,525 | (562) |  |
Sales of shares upon exercise of stock options and purchase rights | 1,640 |  | (1,551) | $ 3,191 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights (in shares) |  |  |  | (213) |  |  |  |
Issuance of shares upon vesting of restricted stock units | (2,188) |  | (3,535) | $ 1,347 |  |  |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (89) |  |  |  |
Share-based compensation | 13,841 |  | 13,841 |  |  |  |  |
End of the period at Dec. 31, 2019 | 1,297,793 | $ 30,148 | 59,668 | $ (159,190) | 1,476,659 | (109,492) |  |
End of the period (in shares) at Dec. 31, 2019 |  | 173,106 |  | 5,901 |  |  |  |
Beginning of the period at Mar. 31, 2020 | 1,489,268 | $ 30,148 | 75,097 | $ (185,896) | 1,690,579 | (120,660) | $ (553) | $ (553)
Beginning of the period (in shares) at Mar. 31, 2020 |  | 173,106 |  | 6,210 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Total comprehensive income | 739,253 |  |  |  | 721,510 | 17,743 |  |
Purchases of registered shares | (72,725) |  |  | $ (72,725) |  |  |  |
Purchase of registered shares (in shares) |  |  |  | 915 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights | 29,709 |  | (1,368) | $ 31,077 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights (in shares) |  |  |  | (1,461) |  |  |  |
Issuance of shares upon vesting of restricted stock units | (29,475) |  | (48,968) | $ 19,493 |  |  |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (1,031) |  |  |  |
Issuance of shares for contingent consideration | 28,463 |  | 18,847 | $ 9,616 |  |  |  |
Issuance of shares for contingent consideration (in shares) |  |  |  | (390) |  |  |  |
Share-based compensation | 64,532 |  | 64,532 |  |  |  |  |
Cash dividends | (146,705) |  |  |  | (146,705) |  |  |
End of the period at Dec. 31, 2020 | 2,101,767 | $ 30,148 | 108,140 | $ (198,435) | 2,264,831 | (102,917) |  |
End of the period (in shares) at Dec. 31, 2020 |  | 173,106 |  | 4,243 |  |  |  |
Beginning of the period at Sep. 30, 2020 | 1,705,963 | $ 30,148 | 78,617 | $ (166,258) | 1,882,308 | (118,852) |  |
Beginning of the period (in shares) at Sep. 30, 2020 |  | 173,106 |  | 4,357 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Total comprehensive income | 398,458 |  |  |  | 382,523 | 15,935 |  |
Purchases of registered shares | (50,271) |  |  | $ (50,271) |  |  |  |
Purchase of registered shares (in shares) |  |  |  | 603 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights | 3,643 |  | (2,733) | $ 6,376 |  |  |  |
Sales of shares upon exercise of stock options and purchase rights (in shares) |  |  |  | (250) |  |  |  |
Issuance of shares upon vesting of restricted stock units | (3,731) |  | (5,833) | $ 2,102 |  |  |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (77) |  |  |  |
Issuance of shares for contingent consideration | 28,463 |  | 18,847 | $ 9,616 |  |  |  |
Issuance of shares for contingent consideration (in shares) |  |  |  | (390) |  |  |  |
Share-based compensation | 19,242 |  | 19,242 |  |  |  |  |
End of the period at Dec. 31, 2020 | $ 2,101,767 | $ 30,148 | $ 108,140 | $ (198,435) | $ 2,264,831 | $ (102,917) |  |
End of the period (in shares) at Dec. 31, 2020 |  | 173,106 |  | 4,243 |  |  |  |

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