Share-based Compensation Expense (Detail) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2017 |
Apr. 30, 2016 |
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
$ 2.2
|
$ 2.9
|
$ 6.4
|
$ 7.1
|
| Income tax effect |
(0.7)
|
(1.0)
|
(2.0)
|
(2.2)
|
| Share-based compensation expense included in net income |
1.5
|
1.9
|
4.4
|
4.9
|
| Cost of Product Sales |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
0.1
|
0.1
|
0.3
|
0.4
|
| Cost of Engineering Sales |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
|
|
0.1
|
|
| Research and Product Development |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
0.4
|
0.6
|
1.2
|
1.8
|
| Selling and Marketing |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
0.2
|
0.4
|
1.1
|
1.1
|
| General and Administrative |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
|
|
|
|
| Total share-based compensation expense before tax |
$ 1.5
|
$ 1.8
|
$ 3.7
|
$ 3.8
|