| Goodwill - Additional Information (Detail) $ in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Mar. 31, 2017  USD ($)  reporting_unit | Mar. 31, 2016  USD ($) | Mar. 31, 2015  USD ($) | |
| Goodwill And Intangible Assets [Line Items] | |||
| Number of reporting units with carrying values greater than 10% of fair value | reporting_unit | 3 | ||
| Adjustments | $ 0 | $ (126) | $ 71,910 | 
| Mirror Image International Holdings Pvt Ltd | |||
| Goodwill And Intangible Assets [Line Items] | |||
| Adjustments | 1,472 | ||
| XYO | |||
| Goodwill And Intangible Assets [Line Items] | |||
| Acquisition | 1,000 | ||
| DT Media (Appia) | |||
| Goodwill And Intangible Assets [Line Items] | |||
| Acquisition | $ 69,438 | ||
| X | ||||||||||
| 
- Definition Goodwill and intangible assets. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Number Of Reporting Units, Carrying Values In Excess Of Fair Value, Greater Than 10 Percent No definition available. 
 | 
| X | ||||||||||
| 
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |