Changes in the Carrying of Goodwill by Reportable Segments (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Dec. 31, 2016 |
Apr. 30, 2017 |
Apr. 30, 2017 |
|
| Goodwill | |||
| Goodwill, beginning balance | $ 73,915,000 | ||
| Impairment losses | (71,600,000) | ||
| Goodwill | $ 73,900,000 | 73,900,000 | |
| Accumulated impairment losses | (71,600,000) | (71,600,000) | |
| Goodwill, Ending Balance | 2,344,000 | 2,344,000 | |
| Medical Imaging | |||
| Goodwill | |||
| Goodwill, beginning balance | 1,800,000 | ||
| Impairment losses | $ 0 | ||
| Goodwill | 1,800,000 | 1,800,000 | |
| Goodwill, Ending Balance | 1,800,000 | 1,800,000 | |
| Ultrasound | |||
| Goodwill | |||
| Goodwill, beginning balance | 71,600,000 | ||
| Impairment losses | 0 | (55,100,000) | (71,600,000) |
| Goodwill | 71,600,000 | 71,600,000 | |
| Accumulated impairment losses | (71,600,000) | (71,600,000) | |
| Goodwill, Ending Balance | 55,100,000 | 0 | 0 |
| Security and Detection | |||
| Goodwill | |||
| Goodwill, beginning balance | 500,000 | ||
| Impairment losses | $ 0 | ||
| Goodwill | 500,000 | 500,000 | |
| Goodwill, Ending Balance | $ 500,000 | $ 500,000 |