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Certain Financial Statement Information (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Certain Financial Statement Information (Textual) [Abstract]          
Non-marketable equity investment $ 0.5 $ 2.5 $ 0.5 $ 2.5  
Anti-dilutive securities that have been excluded from the net (loss) income per share computation 10.7 10.0 10.7 8.4  
Certain Financial Statement Information (Additional Textual) [Abstract]          
Percentage of voting interest 20.00%   20.00%    
Estimated fair value presented were mortgage-backed securities 2.0   2.0   4.6
Gross unrealized gains     8.3   7.5
Products warranty period in years     1 year    
Significant transfers in and out of Level 1 and Level 2 fair value measurements 0   0    
Significant transfers in and out of Level 1 and Level 2 fair value measurements description     There were no significant transfers in and out of Level 1 and Level 2 fair value measurements during the three and six months ended September 30, 2012.    
Recognized other-than-temporary impairment charges 0 0 0 0  
Options and Restricted Stock Units [Member]
         
Certain Financial Statement Information (Textual) [Abstract]          
Effect of dilutive securities that have been excluded from the net loss per share computation 0.5 0.1 0.4 0.6  
Anti-dilutive securities that have been excluded from the net (loss) income per share computation 10.2 9.9 10.3 7.8  
Short-term Investments [Member]
         
Certain Financial Statement Information (Textual) [Abstract]          
Non-marketable equity investment $ 0   $ 0