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Financial Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Mar. 31, 2012
Statement      
Trading investments for deferred compensation plan: $ 15,135,000 $ 15,135,000 $ 14,301,000
Entity's normal operating cycle period   1 year  
Unrealized trading gains (losses) included in other income (expense), net (100,000) 100,000  
Level 1
     
Statement      
Cash and cash equivalents 321,999,000 321,999,000 478,370,000
Total assets at fair value 337,134,000 337,134,000 492,671,000
Level 1 | Money market funds
     
Statement      
Trading investments for deferred compensation plan: 3,319,000 3,319,000 3,383,000
Level 1 | Mutual funds
     
Statement      
Trading investments for deferred compensation plan: 11,816,000 11,816,000 10,918,000
Level 2
     
Statement      
Foreign exchange derivative assets 518,000 518,000 658,000
Total assets at fair value 518,000 518,000 658,000
Foreign exchange derivative liabilities 1,088,000 1,088,000 245,000
Total liabilities at fair value 1,088,000 1,088,000 245,000
Level 3 | Collateralized debt obligations
     
Statement      
Available-for-sale securities     429,000
Total assets at fair value     $ 429,000