Segment Reporting (Narrative) (Details)
3 Months Ended 6 Months Ended
Jan. 31, 2015
customer
Jan. 31, 2014
customer
Jan. 31, 2015
customer
segment
Jan. 31, 2014
customer
Segment Reporting [Abstract]        
Number of reportable segments     2  
Number of customers accounting for over 10% of net sales 0 0 0 0
Number of customers accounting for over 10% of gross accounts receivable 0 0 0 0