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Fair Value of Financial Instruments (Notes)
6 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
 
The carrying amount of cash equivalents approximates fair value because their maturity is less than three months.  Management believes the carrying amount of the equity and cost-method investments materially approximated fair value at September 30, 2017 based upon unobservable inputs. The fair values of these investments have been determined as Level 3 fair value measurements. The carrying amount of accounts receivable, accounts payable and accrued liabilities approximates fair value due to the short-term maturity of the amounts and are considered Level 2 in the fair value hierarchy. 

Fair Value of Subordinated Convertible Debt

The Company measures the fair value of its senior and junior subordinated convertible debt for disclosure purposes. These fair values are based on observable market prices for this debt, which is traded in less active markets and are therefore classified as a Level 2 fair value measurement.

The following table shows the carrying amounts and fair values of the Company's senior and junior subordinated convertible debt as of September 30, 2017 and March 31, 2017 (amounts in thousands). As of September 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 $36.0 million and $38.3 million, respectively.

 
September 30, 2017
 
March 31, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
2017 Senior Debt
$
1,410,892

 
$
2,520,225

 
$
1,384,914

 
$
2,106,225

2015 Senior Debt
$
1,285,498

 
$
3,005,813

 
$
1,261,787

 
$
2,481,708

2017 Junior Debt
$
322,487

 
$
834,665

 
$
262,298

 
$
586,609

2007 Junior Debt
$
5,980

 
$
63,999

 
$
49,952

 
$
445,142