Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2015

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

Cost by major category and accumulated depreciation are summarized as follows:

	March 31,
	2015			2014
	(dollars in thousands)
Land and Quarries	$	345,991		$	171,987
Plants		1,378,497			1,357,594
Buildings, Machinery and Equipment		151,627			111,263
Construction in Progress		86,100			20,131
		1,962,215			1,660,975
Accumulated Depreciation		(740,396	)		(676,924	)
	$	1,221,819		$	984,051