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Long-Term Debt (Tables)
 6 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
 
 
September 30, 2015
 
March 31, 2015
 
 
Carrying Value
 
Fair Value Hedge Adjustment
 
Unamortized Discount (Premium)
 
Maturity Amount
 
Carrying Value
2.7% Senior Notes due July 2019
 
$
256,845

 
$
(7,259
)
 
$
414

 
$
250,000

 
$
254,993

3.95% Senior Notes due July 2024
 
249,600

 
—

 
400

 
250,000

 
249,577

5.625% Senior Notes due January 2044
 
553,457

 
—

 
(3,457
)
 
550,000

 
553,519

Total
 
$
1,059,902

 
$
(7,259
)
 
$
(2,643
)
 
$
1,050,000

 
$
1,058,089