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Financial Information of Segments (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
Corporate Financial Services
        
Segment Reporting Information [Line Items]        
Segment revenues ¥ 17,463 ¥ 19,777 ¥ 53,523 ¥ 59,896
Segment profits (losses) 6,193 4,148 14,749 8,314
Maintenance Leasing
        
Segment Reporting Information [Line Items]        
Segment revenues 57,909 57,001 175,455 169,512
Segment profits (losses) 8,805 6,790 27,117 20,831
Real Estate
        
Segment Reporting Information [Line Items]        
Segment revenues 52,605 43,262 148,511 142,769
Segment profits (losses) (6,331) 1,116 (2,877) 3,508
Investment and Operation
        
Segment Reporting Information [Line Items]        
Segment revenues 16,513 20,120 56,679 66,012
Segment profits (losses) 2,879 4,917 17,810 11,349
Retail
        
Segment Reporting Information [Line Items]        
Segment revenues 37,140 34,301 116,969 109,538
Segment profits (losses) 8,466 5,892 15,321 21,067
Overseas
        
Segment Reporting Information [Line Items]        
Segment revenues 41,978 44,758 133,286 128,655
Segment profits (losses) 10,239 8,559 39,308 31,037
Total
        
Segment Reporting Information [Line Items]        
Segment revenues 223,608 219,219 684,423 676,382
Segment profits (losses) ¥ 30,251 ¥ 31,422 ¥ 111,428 ¥ 96,106