| Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
| Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | |
| Income Tax Disclosure [Abstract] | ||||
| Income tax | $ 437 | $ 229 | $ 141 | $ (243) | 
| Effective tax rate | 5.60% | 2.70% | 1.00% | (1.50%) | 
| X | ||||||||||
| 
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- References No definition available. 
 | 
| X | ||||||||||
| 
- Definition Amount of current tax expense (benefit) and deferred tax expense (benefit) pertaining to income (loss) from continuing operations and income (loss) from discontinued operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 |