Estimated Fair Values of Assets Acquired and Liabilities Assumed for Distributors 2014 Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014 Distributors 2014 [Member]	Sep. 08, 2014 as initially reported	Jan. 31, 2014 as initially reported Distributors 2014 [Member]	Sep. 08, 2014 Scenario, Adjustment [Member]	Jan. 31, 2014 Scenario, Adjustment [Member] Distributors 2014 [Member]
Business Acquisition [Line Items]
Current assets	$ 29,831	$ 3,767	$ 35,909	$ 0	$ (6,078)
Property, plant and equipment	1,938		2,000	0	(62)
Goodwill	13,697	11,255	7,552	55	6,145
Current liabilities	1,010	2,296	1,005	55	5
Net assets acquired and liabilities assumed	44,456	17,571	44,456	55	0
Business Combinations, Preexisting Relationship, Liability Forgiveness	(5,971)		(5,971)		0
Business Acquisition Cost Of Acquired Entity Consideration Paid	$ 38,485		$ 38,485		$ 0