Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
|
3 Months Ended |
6 Months Ended |
|
Apr. 30, 2015 |
Jan. 31, 2016 |
Jul. 31, 2015 |
| Indefinite-lived Intangible Assets [Line Items] |
|
|
|
| Goodwill impairment |
$ 0
|
|
|
| Goodwill |
|
$ 228,500,000
|
$ 223,700,000
|
| Long-term revenue growth rate |
|
3.00%
|
|
| Discount rate |
|
12.00%
|
|
| Intangible assets, net |
|
$ 41,700,000
|
$ 37,900,000
|
| Amortization of existing intangible assets |
|
3,000,000
|
|
| Foreign exchange translation decrease of intangible assets |
|
$ 1,100,000
|
|
| Goodwill, Impairment Test, Benchmark Projected Cash Flow Decrease That Would Result in Potential Impairment, Percent |
|
25.00%
|
|
| Goodwill, Impairment Test, Benchmark Residual Growth Rate Decrease That Would Result in Potential Impairment, Percent |
|
4.50%
|
|
| Goodwill, Impairment Test, Benchmark Discount Rate Increase That Would Result in Potential Impairment, Percent |
|
1.20%
|
|
| Northern Technical |
|
|
|
| Indefinite-lived Intangible Assets [Line Items] |
|
|
|
| Amount of intangibles acquired |
|
$ 7,000,000
|
|
| Industrial Product segment |
|
|
|
| Indefinite-lived Intangible Assets [Line Items] |
|
|
|
| Goodwill |
|
$ 60,200,000
|
|
| Percentage of fair value in excess of carrying amount |
|
14.00%
|
|