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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Mar. 31, 2015
General Discussion of Derivative Instruments and Hedging Activities [Abstract]  
Effect Of Derivative Instruments On Earnings
 
Location of Gain (Loss)
Recognized in Pre-tax
Income
 
Amount of Gain (Loss) Recognized in Pre-Tax Income
(In thousands)
 
Years Ended March 31,
Derivatives in Fair Value Hedging Relationships
 
2014
 
2013
Change in fair value of variable interest rate swaps
Interest expense, net
 
$
(2,490
)
 
$
(4,244
)
Change in carrying value of 2013 Notes
Interest expense, net
 
2,496

 
4,273

Net effect
Interest expense, net
 
$
6

 
$
29