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Geographical Revenues and Income Before Income Taxes (Detail)
In Millions
 12 Months Ended
Mar. 31, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Mar. 31, 2010
JPY (¥)
Mar. 31, 2009
JPY (¥)
Mar. 31, 2011
Japan
USD ($)
Mar. 31, 2011
Japan
JPY (¥)
Mar. 31, 2010
Japan
JPY (¥)
Mar. 31, 2009
Japan
JPY (¥)
Mar. 31, 2011
Americas
USD ($)
Mar. 31, 2011
Americas
JPY (¥)
Mar. 31, 2010
Americas
JPY (¥)
Mar. 31, 2009
Americas
JPY (¥)
Mar. 31, 2011
Other Countries
USD ($)
Mar. 31, 2011
Other Countries
JPY (¥)
Mar. 31, 2010
Other Countries
JPY (¥)
Mar. 31, 2009
Other Countries
JPY (¥)
Mar. 31, 2011
Difference between Geographic Total and Consolidated Amounts
USD ($)
Mar. 31, 2011
Difference between Geographic Total and Consolidated Amounts
JPY (¥)
Mar. 31, 2010
Difference between Geographic Total and Consolidated Amounts
JPY (¥)
Mar. 31, 2009
Difference between Geographic Total and Consolidated Amounts
JPY (¥)
Segment Reporting Information [Line Items]                                        
Total Revenues $ 11,667 ¥ 970,110 ¥ 912,294 ¥ 1,032,486 $ 9,277 ¥ 771,403 ¥ 784,537 ¥ 933,951 $ 1,671 [1] ¥ 138,975 [1] ¥ 96,879 [1] ¥ 68,026 [1] $ 995 [2] ¥ 82,772 [2] ¥ 81,919 [2] ¥ 95,265 [2] $ (276) ¥ (23,040) ¥ (51,041) ¥ (64,756)
Income before income Taxes $ 1,106 ¥ 91,965 ¥ 54,593 ¥ 12,035 $ 751 ¥ 62,477 ¥ 33,180 ¥ 8,695 $ 221 [1] ¥ 18,411 [1] ¥ 18,743 [1] ¥ 3,191 [1] $ 297 [2] ¥ 24,633 [2] ¥ 17,123 [2] ¥ 18,032 [2] $ (163) ¥ (13,556) ¥ (14,453) ¥ (17,883)
[1] Mainly United States
[2] Mainly Asia, Europe, Oceania and Middle East