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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Mar. 31, 2018
Property Plant And Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT

(C) Property, Plant and Equipment

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

 

 

 

March 31,

 

 

 

2018

 

 

2017

 

 

 

(dollars in thousands)

 

Land and Quarries

 

$

423,543

 

 

$

402,698

 

Plants

 

 

1,871,213

 

 

 

1,820,908

 

Buildings, Machinery and Equipment

 

 

187,484

 

 

 

175,526

 

Construction in Progress

 

 

104,288

 

 

 

40,306

 

 

 

 

2,586,528

 

 

 

2,439,438

 

Accumulated Depreciation

 

 

(991,229

)

 

 

(892,601

)

 

 

$

1,595,299

 

 

$

1,546,837