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SUMMARY OF ACCOUNTING POLICIES (Details) (USD $)
12 Months Ended
Mar. 31, 2013
customer
Mar. 31, 2012
customer
Mar. 31, 2011
Revenue Recognition      
Research and development costs   $ 78,900,000 $ 46,500,000
Allowance for doubtful accounts      
Balance at Beginning of Year 38,905,000 13,222,000 13,163,000
Charged to Costs and Expenses 6,643,000 30,122,000 3,877,000
Deductions/Write-offs (34,671,000) (4,439,000) (3,818,000)
Balance at End of Year 10,877,000 38,905,000 13,222,000
Amount of direct deductions/write-downs for accounts receivable balances reclassified to non-current assets and carried net of specific reserve 5,800,000 3,900,000  
Provision for doubtful accounts related to a distressed customer   28,000,000  
Provision for doubtful accounts related to discontinued operations   200,000 200,000
Maximum percentage of credit exposure 20.00%    
Maximum amount of credit exposure $ 10,000,000    
Number of customers accounting for greater than 10% of net sales 0    
Number of customers accounting for greater than 10% of accounts receivable 0 0  
Maximum
     
Revenue Recognition      
Net sales (as a percent) 10.00% 10.00% 10.00%
Net sales | Customer concentration risk | Customer one
     
Concentration of credit risk      
Concentration risk percentage   11.00%  
Net sales | Customer concentration risk | Customer two
     
Concentration of credit risk      
Concentration risk percentage   10.00%  
Net sales | Customer concentration risk | Two Customers
     
Concentration of credit risk      
Concentration risk percentage     11.00%
Net sales | Customer concentration risk | Ten largest customers
     
Concentration of credit risk      
Concentration risk percentage 47.00% 55.00% 52.00%