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