Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans (Details 3)

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Pension and Other Post-retirement Benefit Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension
   
Weighted-average assumptions used to determine projected benefit obligation    
Discount rate (as a percent) 4.50% 4.20%
Rate of compensation increase (as a percent) 3.50% 2.90%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount rate (as a percent) 4.20% 5.00%
Rate of compensation increase (as a percent) 2.90% 2.90%
Expected return on plan assets (as a percent) 4.00% 4.40%
Other Benefits
   
Weighted-average assumptions used to determine projected benefit obligation    
Discount rate (as a percent) 2.80% 3.50%
Health care cost trend on covered charges (as a percent) 7.00% 7.50%
Ultimate health care cost trend on covered charges (as a percent) 5.00% 5.00%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount rate (as a percent) 3.50% 4.40%
Health care cost trend on covered charges (as a percent) 7.50% 7.50%
Ultimate health care cost trend on covered charges (as a percent) 5.00% 5.00%
Effect of a one percentage point increase in assumed health care cost trend:    
On total service and interest costs components   1
On post-retirement benefits obligation 11 27
Effect of a one percentage point decrease in assumed health care cost trend:    
On total service and interest costs components   (1)
On post-retirement benefits obligation (10) (25)