Summary of Significant Accounting Policies (Details)	12 Months Ended
Jul. 31, 2015 USD ($) item	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)
Revenue recognition - reductions
Number of customers all products shipped FOB destination	1
Volume rebates \| $	$ 5,597,000	$ 4,498,000	$ 4,277,000

The aggregate selling price reductions recognized during an accounting period including, but not limited to, the sale of defective or nonconforming goods, a strategy to increase sales (generally over the short-term), move slow-moving items, develop distribution channels, or reward valuable customers. Allowances are a deduction from gross revenue in arriving at net revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration