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Property and Equipment (Details Textual) (USD $)	12 Months Ended
Property and Equipment (Details Textual) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Property and Equipment (Textual) [Abstract]
Depreciation Expense	$ 15,255,000	$ 14,140,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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