Warranties (Tables)

12 Months Ended

Jan. 31, 2012

Product Warranty Costs [Abstract]

Warranties

Changes in the warranty accrual were as follows:

	As of January 31
	2012			2011			2010
Beginning balance	$	1,437		$	1,259		$	1,004
Acquired	192			—			—
Accrual for warranties	3,010			2,461			2,426
Settlements made (in cash or in kind)	(2,940		)	(2,283		)	(2,171		)
Ending balance	$	1,699		$	1,437		$	1,259