Contingencies and Legacy Environmental Commitments (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Environmental Activity

The environmental activity is summarized as follows:

Balance at March 31, 2011	$	14,293
Environmental costs incurred		(1,177	)
Interest accretion		419
Balance at March 31, 2012		13,535
Environmental costs incurred		(1,245	)
Interest accretion		394
Balance at March 31, 2013		12,684
Environmental costs incurred		(1,487	)
Interest accretion		333
Reduction of environmental reserve-Wyoming Illinois		(1,207)
Balance at March 31, 2014	$	10,323