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Fair Value of Financial Instruments (Tables)
3 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Carrying amounts and fair values of subordinated convertible debentures
The following table shows the carrying amounts and fair values of the Company's senior and junior subordinated convertible debt as of June 30, 2017 and March 31, 2017 (amounts in thousands). As of June 30, 2017 and March 31, 2017, the carrying amounts of the Company's senior and junior subordinated convertible debt have been reduced by debt issuance costs of $37.0 million and $38.3 million, respectively.

 
June 30, 2017
 
March 31, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
2017 Senior Debt
$
1,397,808

 
$
2,187,907

 
$
1,384,914

 
$
2,106,225

2015 Senior Debt
$
1,273,559

 
$
2,591,002

 
$
1,261,787

 
$
2,481,708

2017 Junior Debt
$
320,254

 
$
718,662

 
$
262,298

 
$
586,609

2007 Junior Debt
$
11,256

 
$
110,356

 
$
49,952

 
$
445,142