UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 269,866	$ 272,304
Cost of sales	210,736	215,865
Gross profit	59,130	56,439
Professional and other fees	1,518	1,833
Salaries and benefits	35,214	32,947
General and administrative expenses	6,779	6,273
Interest and financing costs	553	644
Operating expenses	44,064	41,697
Operating income	15,066	14,742
Other income	0	1,434
Earnings before tax	15,066	16,176
Provision for income taxes	6,252	6,699
Net earnings	$ 8,814	$ 9,477
Net earnings per common share-basic (In dollars per share)	$ 1.22	$ 1.26
Net earnings per common share-diluted (In dollars per share)	$ 1.21	$ 1.25
Weighted average common shares outstanding-basic (In shares)	7,225	7,504
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING-DILUTED (In shares)	7,301	7,559