Acquisitions and Purchase Accounting Estimated Fair Values of Assets Acquired and Liabilities Assumed for Nieco Acquisition (Details) (Nieco Corporation [Member], USD $) In Thousands, unless otherwise specified	Oct. 31, 2012
Business Acquisition [Line Items]
Cash	$ 140
Current assets	4,011
Property, plant and equipment	268
Goodwill	15,382
Other intangibles	9,680
Current liabilities	1,836
Other non-current liabilities	3,645
Consideration paid at closing	24,000
Contingent consideration	3,645
Net assets acquired and liabilities assumed	27,645
as initially reported
Business Acquisition [Line Items]
Cash	140
Current assets	4,011
Property, plant and equipment	268
Goodwill	18,855
Other intangibles	5,620
Current liabilities	1,836
Other non-current liabilities	3,058
Consideration paid at closing	24,000
Contingent consideration	3,058
Net assets acquired and liabilities assumed	27,058
Scenario, Adjustment [Member]
Business Acquisition [Line Items]
Cash	0
Current assets	0
Property, plant and equipment	0
Goodwill	(3,473)
Other intangibles	4,060
Current liabilities	0
Other non-current liabilities	587
Consideration paid at closing	0
Contingent consideration	587
Net assets acquired and liabilities assumed	$ 587