(2) Bill and Hold (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	14 Months Ended	24 Months Ended
	Apr. 01, 2014 T	Jun. 01, 2014 T	Jun. 01, 2014 T	Apr. 01, 2014 T	Mar. 31, 2013 T
Tons of Coal Agreed to Store Per Customer				250,000
Tons of Coal Agreed to Store for Second Customer			250,000
Tons of Coal Stored First Customer	250,000
Tons of Coal Stored for First Customer at Reporting Date					250,000
Tons of Coals Stored Second Customer		220,000
Tons of Coal Stored for Second Customer at Reporting Date					220,000
Revenue from Bill and Hold (in Dollars)					$ 3.3