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Business Combination - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Customer Relationships
Year
Mar. 31, 2012
Developed Technology Rights
Year
Mar. 31, 2012
Trademarks
Year
Mar. 31, 2012
Trade Accounts Receivable
Mar. 31, 2012
Kverneland Asa
Business Acquisition [Line Items]              
Percentage of outstanding shares acquired             78.95%
Cash consideration paid to acquire shares             ¥ 18,105
Fair value of noncontrolling interest             4,993
Acquisition-related cost             524
Current assets acquired, at fair value           7,129  
Current assets acquired, contractual amount           7,366  
Finite-lived intangible assets acquired ¥ 17,414 ¥ 1,372 ¥ 6,441 ¥ 3,037 ¥ 1,391    
Acquired intangible assets, weighted average useful life, years     13 6 10