Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2000
Shipping, Handling and Transportation Costs $ 16.0 $ 20.3 $ 22.2  
Advertising Expense 8.2 4.3 5.0  
Cash Equivalent Description 90 days      
Other Investments Accounting Method Description Investments in private technology venture limited partnerships are currently accounted for using the equity method because these investments individually represent voting ownership interests of less than 20%. Ownership interests in these limited partnerships are accounted for under the equity method unless our interest is so minor (typically less than 5%) that we have virtually no influence over the partnership operating and financial policies, in which case the cost method is used.      
Stock Repurchase Program, Authorized Amount       700
Stock Repurchase Program, Remaining Authorized Repurchase Amount 87.9 87.9    
Foreign Currency Transaction Loss, before Tax 0.5 0.1    
Foreign Currency Transaction Gain, before Tax     $ 0.3  
Standard Product Warranty Description We warrant our products against defects for 1 to 3 years. A provision for estimated future costs and estimated returns for credit relating to warranty is recorded when products are shipped and revenue recognized. Our estimate of future costs to satisfy warranty obligations is primarily based on historical trends and, if believed to be significantly different from historical trends, estimates of future failure rates and future costs of repair. Future costs of repair include materials consumed in the repair, labor and overhead amounts necessary to perform the repair. If future actual failure rates differ from our estimates, we record the impact in subsequent periods. If future actual costs of repair were to differ significantly from our estimates, we would record the impact of these unforeseen cost differences in subsequent periods.      
Inventories [Member]
        
Standard Product Warranty Description we generally provide product warranty for 1 to 3 years.      
Top Five Customers [Member]
        
Sales Revenue, Goods, Net, Percentage 32.00% 34.00% 33.00%  
Single Customer Accounting For More Than Ten Percent [Member]
        
Sales Revenue, Goods, Net, Percentage 0.00% 0.00% 10.00%