Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012
Assets Acquired:
Cash	$ 1,529
Receivables	5,002
Inventories	7,602
Prepaid expenses and other current assets	172
Current deferred income taxes	466
Property, plant and equipment	3,774
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets	29,500
Goodwill	26,305
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total assets acquired	74,350
Liabilities Assumed:
Payables	3,430
Accrued compensation and employee benefits	569
Income taxes	31
Long-term deferred income taxes	12,273
Other long-term liabilities	451
Total liabilities assumed	$ 16,754