Research and development costs	12 Months Ended
Mar. 31, 2012
Research and development costs [Abstract]
Research and development costs	Note 2: Research and development costs Research and development costs charged to operations totaled $70,207 in fiscal 2012, $66,971 in fiscal 2011, and $56,899 in fiscal 2010.

The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.

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