Fair Value Measurement Of Assets And Liabilities (Financial Liabilities Not Carried At Fair Value) (Details) (USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount, Total	$ 2,203,765	$ 2,213,435
Fair Value, Total	2,144,012	2,199,061
Level 1 [Member] | Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount, Total	1,665,765	1,674,435
Fair Value, Total	1,617,063	1,662,714
Level 2 [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount, Total	160,000	160,000
Fair Value, Total	160,000	160,000
Level 2 [Member] | Asia Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount, Total	378,000	379,000
Fair Value, Total	$ 366,948	$ 376,347