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	$ 27,808
Property, plant and equipment	1,709
Goodwill	16,199
Current liabilities	1,260
Net assets acquired and liabilities assumed	44,456
Business Combinations, Preexisting Relationship, Liability Forgiveness	(5,971)
Consideration paid at closing	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)
Consideration paid at closing	38,485
Scenario, Adjustment [Member]
Business Acquisition [Line Items]
Current assets	(8,101)
Property, plant and equipment	(291)
Goodwill	8,647
Current liabilities	255
Net assets acquired and liabilities assumed	0
Business Combinations, Preexisting Relationship, Liability Forgiveness	0
Consideration paid at closing	$ 0