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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
--- | --- | --- | --- | --- | --- | ---
Beginning of the period (in shares) at Mar. 31, 2015 |  | 173,106 |  | 8,625 |  |
Beginning of the period at Mar. 31, 2015 | $ 758,134 | $ 30,148 | $ 0 | $ (88,951) | $ 930,174 | $ (113,237)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Total comprehensive income | 120,569 |  |  |  | 119,317 | 1,252
Purchases of registered shares (in shares) |  |  |  | 4,951 |  |
Purchases of registered shares | (70,358) |  |  | $ (70,358) |  |
Tax effects from share-based awards | (2,353) |  | (2,353) |  |  |
Sale of shares upon exercise of stock options and purchase rights | 19,767 |  | (737) | $ 20,504 |  |
Sale of shares upon exercise of options and purchase rights (in shares) |  |  |  | (1,812) |  |
Issuance of shares upon vesting of restricted stock units | (7,247) |  | (17,645) | $ 10,398 |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (1,067) |  |
Share-based compensation | 27,351 |  | 27,351 |  |  |
Cash dividends | (85,915) |  |  |  | (85,915) |
End of the period (in shares) at Mar. 31, 2016 |  | 173,106 |  | 10,697 |  |
End of the period balance at Mar. 31, 2016 | 759,948 | $ 30,148 | 6,616 | $ (128,407) | 963,576 | (111,985)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Total comprehensive income | 217,155 |  |  |  | 205,876 | 11,279
Purchases of registered shares (in shares) |  |  |  | 4,027 |  |
Purchases of registered shares | (83,786) |  |  | $ (83,786) |  |
Tax effects from share-based awards | (1,251) |  | (1,251) |  |  |
Sale of shares upon exercise of stock options and purchase rights | 39,574 |  | 15,403 | $ 24,171 |  |
Sale of shares upon exercise of options and purchase rights (in shares) |  |  |  | (2,513) |  |
Issuance of shares upon vesting of restricted stock units | (18,412) |  | (30,148) | $ 13,985 | (2,249) |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (1,484) |  |
Share-based compensation | 35,976 |  | 35,976 |  |  |
Cash dividends | (93,093) |  |  |  | (93,093) |
End of the period (in shares) at Mar. 31, 2017 |  | 173,106 |  | 10,727 |  |
End of the period balance at Mar. 31, 2017 | 856,111 | $ 30,148 | 26,596 | $ (174,037) | 1,074,110 | (100,706)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | 57,209 |  | 3,297 |  | 53,912 |
Total comprehensive income | 215,793 |  |  |  | 208,542 | 7,251
Purchases of registered shares (in shares) |  |  |  | 863 |  |
Purchases of registered shares | (30,722) |  |  | $ (30,722) |  |
Sale of shares upon exercise of stock options and purchase rights | 41,910 |  | 21,315 | $ 20,595 |  |
Sale of shares upon exercise of options and purchase rights (in shares) |  |  |  | (1,527) |  |
Issuance of shares upon vesting of restricted stock units | (29,813) |  | (48,291) | $ 18,478 |  |
Issuance of shares upon vesting of restricted stock units (in shares) |  |  |  | (1,536) |  |
Share-based compensation | 44,317 |  | 44,317 |  |  |
Cash dividends | (104,248) |  |  |  | (104,248) |
End of the period (in shares) at Mar. 31, 2018 |  | 173,106 |  | 8,527 |  |
End of the period balance at Mar. 31, 2018 | $ 1,050,557 | $ 30,148 | $ 47,234 | $ (165,686) | $ 1,232,316 | $ (93,455)

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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