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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,197 $ 1,046 $ 2,392 $ 2,270
Interest cost 2,865 3,153 5,722 6,319
Expected return on plan assets (3,543) (3,197) (7,085) (6,694)
Settlement costs 0 1,329 0 1,329
Net amortization and deferral 2,447 2,846 4,894 5,364
Net periodic benefit cost 2,966 5,177 5,923 8,588
Other Postretirement Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 131 146 269 294
Interest cost 508 569 1,040 1,145
Expected return on plan assets (30) (31) (60) (62)
Settlement costs 0 0 0 0
Net amortization and deferral (17) 48 (34) 100
Net periodic benefit cost $ 592 $ 732 $ 1,215 $ 1,477