Operating Segments - Concentration Risk (Details) - Segment sales - Customer concentration |
3 Months Ended |
|---|---|
|
Oct. 31, 2016
customer
| |
| Water Purification and Filtration | Two customers | |
| Concentration risk | |
| Number of customers accounting for a percentage of segment net sales | 2 |
| Concentration risk within segment (as a percent) | 46.30% |
| Healthcare Disposables | Four customers | |
| Concentration risk | |
| Number of customers accounting for a percentage of segment net sales | 4 |
| Concentration risk within segment (as a percent) | 51.60% |
| Dialysis | Two customers | |
| Concentration risk | |
| Number of customers accounting for a percentage of segment net sales | 2 |
| Concentration risk within segment (as a percent) | 45.50% |