Annual report pursuant to Section 13 and 15(d)

Acquisitions and Disposals - Amortization Period for Intangible Assets Acquired (Detail)

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Acquisitions and Disposals - Amortization Period for Intangible Assets Acquired (Detail)
 12 Months Ended
Mar. 31, 2016
Mirror Image International Holdings Pvt Ltd  
Business Acquisition [Line Items]  
Useful life of goodwill Indefinite
Mirror Image International Holdings Pvt Ltd | Customer relationships  
Business Acquisition [Line Items]  
Remaining useful life 14 years
Mirror Image International Holdings Pvt Ltd | Developed technology  
Business Acquisition [Line Items]  
Remaining useful life 5 years
Mirror Image International Holdings Pvt Ltd | Trade name/trademark  
Business Acquisition [Line Items]  
Remaining useful life 5 years
Mirror Image International Holdings Pvt Ltd | Library  
Business Acquisition [Line Items]  
Remaining useful life 5 years
DT Media (Appia)  
Business Acquisition [Line Items]  
Useful life of goodwill Indefinite
DT Media (Appia) | Developed technology  
Business Acquisition [Line Items]  
Remaining useful life 4 years
DT Media (Appia) | Trade name/trademark  
Business Acquisition [Line Items]  
Remaining useful life 2 years
DT Media (Appia) | Publisher relationships  
Business Acquisition [Line Items]  
Remaining useful life 2 years
DT Media (Appia) | Advertiser relationships  
Business Acquisition [Line Items]  
Remaining useful life 2 years