Long-Term Debt (Tables)

12 Months Ended

Mar. 31, 2012

Long-term Debt Disclosure [Abstract]

Schedule of accreted value of long-term debt

	2012						2011
	Current Accreted Value		Unamortized Discount		Maturity Amount		Accreted Value
2.5% convertible senior notes	$	1,127,009	$	122,991	$	1,250,000	$	1,087,932
5.6% senior notes from Equity Units	—		—		—		103,039
Other term loans	9,883		—		9,883		10,897
Subtotal	1,136,892		122,991		1,259,883		1,201,868
Less: current portion	1,278		—		1,278		792
Total	$	1,135,614	$	122,991	$	1,258,605	$	1,201,076

Schedule of aggregate maturities of long-term debt based on contractual terms

2013	$	1,278
2014	1,332
2015	1,251,386
2016	5,887
2017	—
Thereafter	—
Total	$	1,259,883