Customer and Geographic Information (Details) - USD ($)
|
3 Months Ended |
6 Months Ended |
Jan. 31, 2016 |
Jan. 31, 2015 |
Jan. 31, 2016 |
Jan. 31, 2015 |
| Major customer |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Minimum percentage of consolidated net sales sold to one customer or individual country requiring additional and separate disclosure |
10.00%
|
|
10.00%
|
10.00%
|
| Major customer | Sales Revenue, Net |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| U.S. government |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
42.00%
|
27.50%
|
41.70%
|
26.20%
|
| Commercial (United States) |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
20.00%
|
11.70%
|
17.40%
|
12.80%
|
| Total United States |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
62.00%
|
39.20%
|
59.10%
|
39.00%
|
| North African country |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
2.40%
|
15.00%
|
4.20%
|
14.80%
|
| Other international |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
35.60%
|
45.80%
|
36.70%
|
46.20%
|
| Total International |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Revenue generated from external customers |
$ 26,731,000
|
$ 49,768,000
|
$ 54,983,000
|
$ 96,524,000
|
| Percentage of revenue generated from external customer type |
38.00%
|
60.80%
|
40.90%
|
61.00%
|
| U.S. Prime Contractor | Major customer | Sales Revenue, Net |
|
|
|
|
| Revenues from External Customers |
|
|
|
|
| Percentage of revenue generated from external customer type |
|
14.40%
|
|
14.40%
|