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Geographical Revenues and Income Before Income Taxes (Detail) (JPY ¥)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]        
Total revenues ¥ 232,826 ¥ 226,458 ¥ 714,587 ¥ 695,648
Income before Income Taxes 26,739 23,485 102,512 75,163
Japan
        
Segment Reporting Information [Line Items]        
Total revenues 182,934 177,188 559,891 557,031
Income before Income Taxes 14,314 19,452 61,709 54,720
Americas
        
Segment Reporting Information [Line Items]        
Total revenues 32,038 [1] 35,199 [1] 91,204 [1] 103,462 [1]
Income before Income Taxes 5,451 [1] 4,412 [1] 18,611 [1] 13,903 [1]
Other Countries
        
Segment Reporting Information [Line Items]        
Total revenues 20,262 [2] 19,685 [2] 71,234 [2] 59,280 [2]
Income before Income Taxes 6,463 [2] 4,527 [2] 23,862 [2] 17,134 [2]
Difference between Geographic Total and Consolidated Amounts
        
Segment Reporting Information [Line Items]        
Total revenues (2,408) (5,614) (7,742) (24,125)
Income before Income Taxes ¥ 511 ¥ (4,906) ¥ (1,670) ¥ (10,594)
[1] Mainly United States
[2] Mainly Asia, Europe, Oceania and Middle East