Consolidated Statements of Shareholders' Equity,,Yen in Thousands,,,,
,Outstanding Number of Shares of Common Stock,Common Stock,Capital  Surplus,Retained Earnings,Unrealized Gain(Loss) on Available-for-Sale Securities,Foreign Currency Translation Adjustments
"BALANCE, APRIL 1, 1999","380,000 ","\1,640,000","\1,550,000","\3,374,688",,
Adjustment of retained earnings for the adoption of interperiod allocation of income taxes,,,,"46,593",,
Net income,,,,"1,152,382 ",,
"Cash dividends, \250 per share",,,,"(95,000)",,
Bonuses to directors and corporate auditors,,,,"(35,000)",,
Stock split,"7,220,000 ",,,,,
"BALANCE, MARCH 31, 2000","7,600,000 ","\1,640,000","\155,000","\4,443,663",,
Issuance of common stock,"600,000 ","293,400 ","366,480 ",,,
Net income,,,,"585,970 ",,
"Cash dividends, \15 per share",,,,"(114,000)",,
Bonuses to directors and corporate auditors,,,,"(35,000)",,
Unrealized losses on available-for-sale securities,,,,,"(8,721)",
Foreign currency translation adjustments,,,,,,"(252,905)"
"BALANCE, MARCH 31, 2001","8,200,000 ","\1,933,400","\1,916,480","\4,880,633","(\8,721)","(\252,905)"
Net income,,,,"608,789 ",,
"Cash dividends, \18 per share",,,,"(147,600)",,
Bonuses to directors and corporate auditors,,,,"(35,000)",,
Net decrease in unrealized losses on available-for-sale securities,,,,,"6,839 ",
Net change in foreign currency translation adjustments,,,,,,"\65,655 "
"BALANCE, MARCH 31, 2002","8,200,000 ","\1,933,400","\1,916,480","\5,306,822","(\1,882)","(\187,250)"
Net income,,,,"863,095 ",,
"Cash dividends, \27 per share",,,,"(221,400)",,
Bonuses to directors and corporate auditors,,,,"(35,000)",,
Net decrease in unrealized losses on available-for-sale securities,,,,,(573),
Net change in foreign currency translation adjustments,,,,,,"(32,210)"
"BALANCE, MARCH 31, 2003","8,200,000 ","\1,933,400 ","\1,916,480 ","\5,913,517 ","(\2,455)","(\219,460)"
Net income,,,,"1,609,507 ",,
"Cash dividends, \25 per share",,,,"(205,000)",,
Bonuses to directors and corporate auditors,,,,"(37,000)",,
Net decrease in unrealized losses on available-for-sale securities,,,,,"15,480 ",
Net change in foreign currency translation adjustments,,,,,,"(59,914)"
"BALANCE, MARCH 31, 2004","8,200,000","\1,933,400","\1,916,480","\7,281,024","\13,025","(\279,374)"
Issuance of common stock,"700,000 ","1,735,300 ","1,784,124 ",,,
Net income,,,,"2,828,101 ",,
"Cash dividends, \56 per share",,,,"(459,200)",,
Bonuses to directors and corporate auditors,,,,"(49,500)",,
Net increase in unrealized gain on available-for-sale securities,,,,,"7,038 ",
Net change in foreign currency translation adjustments,,,,,,"34,098 "
"BALANCE, MARCH 31, 2005","8,900,000","\3,668,700","\3,700,604","\9,600,425","\20,063","(\245,276)"
Stock split,"8,900,000 ",,,,,
Net income,,,,"3,051,549 ",,
"Cash dividends, \52 per share",,,,"(640,800)",,
Bonuses to directors and corporate auditors,,,,"(85,000)",,
Net increase in unrealized gain on available-for-sale securities,,,,,"24,887 ",
Net change in foreign currency translation adjustments,,,,,,"156,674 "
"BALANCE, MARCH 31, 2006","17,800,000","\3,668,700","\3,700,604","\11,926,174","\44,950","(\88,602)"