Segment Reporting (Narrative) (Details)	3 Months Ended	6 Months Ended
Jan. 31, 2017 customer	Jan. 31, 2016 customer	Jan. 31, 2017 customer segment	Jan. 31, 2016 customer	Jul. 31, 2016 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	0	0
Number of customers accounting for over ten percent of gross accounts receivable	0		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