Selected Balance Sheet Information (Tables)

3 Months Ended

Apr. 30, 2012

Selected Balance Sheet Information [Abstract]

Components of selected balance sheet items

Following are the components of selected balance sheet items:

	April 30, 2012		January 31, 2012		April 30, 2011
Inventories:
Finished goods	$	7,688	$	7,094	$	7,916
In process	6,847		6,105		5,986
Materials	40,129		41,557		31,636
	$	54,664	$	54,756	$	45,538
Accrued liabilities:
Salaries and benefits	$	2,635	$	4,297	$	1,972
Vacation	4,584		4,387		3,504
401(k) contributions	555		966		228
Insurance obligations	2,887		2,789		3,134
Profit sharing	413		1,244		354
Warranties	1,792		1,699		1,631
Acquisition-related contingent consideration	6,658		3,266		266
Other	1,141		1,749		693
	$	20,665	$	20,397	$	11,782
Other liabilities:
Postretirement benefits	$	7,423	$	7,348	$	5,774
Acquisition-related contingent consideration	2,169		7,655		2,249
Deferred income taxes	3,944		4,518		102
Uncertain tax positions	5,395		4,946		4,512
	$	18,931	$	24,467	$	12,637