Acquisitions Contech (Details) (Contech [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended			3 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Apr. 17, 2014	Aug. 02, 2013	Jul. 31, 2014 Contech Sellers [Member]	Apr. 30, 2014 Contech Sellers [Member]
Business Acquisition [Line Items]
Net assets acquired			$ 42,536
Net of Cash Acquired				42,187
Cash Acquired Placed In Escrow				3,825
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	720				2,280	349
Accounts Receivable			2,126
Inventory			1,529
Prepaid Assets And Other			170
Property, Plant, and Equipment			36,976
Goodwill			4,605
Intangible assets			2,898
Accounts payable and other			(5,768)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		$ (2,981)