Segment Information (Tables)

12 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Summary of Segment Information

Sales are primarily within the United States and all assets are located within the United States.

Reportable Segments	Industrial		Water Treatment		Total
(In thousands)
Fiscal Year Ended March 31, 2013:
Sales	$	248,556	$	101,831	$	350,387
Gross profit	28,878		28,058		56,936
Selling, general, and administrative expenses	19,923		11,683		31,606
Operating income	8,955		16,375		25,330
Identifiable assets*	$	143,827	$	25,448	$	169,275
Fiscal Year Ended April 1, 2012:
Sales	$	251,451	$	92,383	$	343,834
Gross profit	40,357		25,511		65,868
Selling, general, and administrative expenses	19,805		10,954		30,759
Operating income	20,552		14,557		35,109
Identifiable assets*	$	129,782	$	23,543	$	153,325
Fiscal Year Ended April 3, 2011:
Sales	$	208,724	$	88,917	$	297,641
Gross profit	36,938		24,964		61,902
Selling, general, and administrative expenses	19,828		10,112		29,940
Operating income	17,110		14,852		31,962
Identifiable assets*	$	121,250	$	21,139	$	142,389

* Unallocated assets consisting primarily of cash and cash equivalents, investments and prepaid expenses were $52.9 million at March 31, 2013, $48.0 million at April 1, 2012 and $41.7 million at April 3, 2011. Additionally, assets associated with the discontinued operations of the Pharmaceutical segment were zero at March 31, 2013, $1.2 million at April 1, 2012 and $0.9 million at April 3, 2011.