Segment Reporting (Narrative) (Details)	3 Months Ended
Oct. 31, 2016 customer segment	Oct. 31, 2015 customer
Segment Reporting, Measurement Disclosures [Abstract]
Number of reportable segments \| segment	2
Number of customers accounting for over ten percent of net sales	0	0
Number of customers accounting for over ten percent of gross accounts receivable	0	0

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration