Shareholders' Equity (Schedule Of Effects Of Changes In Ownership Interests In Subsidiaries) (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Shareholders' Equity [Abstract]
Net income attributable to Kubota Corporation	¥ 61,552	¥ 54,822	¥ 42,326
Increase in capital surplus for purchases of noncontrolling interests	319	425	125
Decrease in capital surplus for purchases of noncontrolling interests	(724)	(726)	(3,828)
Increase in capital surplus for changes in ownership interests in subsidiaries from other transactions	124	199
Decrease in capital surplus for changes in ownership interests in subsidiaries from other transactions	(25)		(206)
Net transfers to the noncontrolling interests	(306)	(102)	(3,909)
Change from net income attributable to Kubota Corporation and transfer to noncontrolling interests	¥ 61,246	¥ 54,720	¥ 38,417

This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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Reference 11: http://www.xbrl.org/2003/role/presentationRef

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

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Reference 13: http://www.xbrl.org/2003/role/presentationRef

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Reference 15: http://www.xbrl.org/2003/role/presentationRef

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Reference 16: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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