Restructuring and Related Charges by Segment (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2017 |
Apr. 30, 2016 |
|
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring and related charges | $ 2.1 | $ 1.8 | $ 2.4 | $ 8.3 |
| Medical Imaging | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring and related charges | 0.2 | 1.1 | 0.4 | 5.1 |
| Ultrasound | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring and related charges | 1.8 | 0.4 | 1.9 | 1.7 |
| Security and Detection | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring and related charges | $ 0.1 | $ 0.3 | $ 0.1 | $ 1.5 |