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Warranties (Tables)
 12 Months Ended
Jan. 31, 2013
Product Warranty Costs [Abstract]  
Warranties
Changes in the warranty accrual were as follows:
 
 
For the years ended January 31,
 
 
2013
 
2012
 
2011
Beginning balance
 
$
1,699

 
$
1,437

 
$
1,259

Acquired
 
—

 
192

 
—

Accrual for warranties
 
2,968

 
3,010

 
2,461

Settlements made (in cash or in kind)
 
(2,779
)
 
(2,940
)
 
(2,283
)
Ending balance
 
$
1,888

 
$
1,699

 
$
1,437