Quarterly Results (unaudited) (Tables)

12 Months Ended

Mar. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Results (unaudited)

	For the Years Ended March 31,
	2016		2015
	(dollars in thousands, except per share data)
First Quarter -
Revenues	$	284,963	$	266,251
Gross Profit		61,097		56,401
Earnings Before Income Taxes		55,885		55,786
Net Earnings		37,762		37,710
Diluted Earnings Per Share	$	0.75	$	0.75
Second Quarter -
Revenues	$	328,988	$	284,808
Gross Profit		44,294		75,061
Earnings Before Income Taxes		42,840		74,577
Net Earnings		29,819		50,319
Diluted Earnings Per Share	$	0.59	$	1.00
Third Quarter -
Revenues	$	277,409	$	291,529
Gross Profit		68,865		79,149
Earnings Before Income Taxes		68,205		77,866
Net Earnings		45,848		52,030
Diluted Earnings Per Share	$	0.92	$	1.03
Fourth Quarter -
Revenues	$	252,132	$	223,780
Gross Profit		57,361		43,522
Earnings Before Income Taxes		52,322		44,698
Net Earnings		39,163		46,794
Diluted Earnings Per Share	$	0.80	$	0.93