Consolidation Of A Variable Interest Entity (Details)	Mar. 31, 2012	Mar. 31, 2011
Syntel Delaware [Member]
Revenue, Major Customer [Line Items]
Ownership percentage in subsidiary	100.00%
SSSSML [Member]
Revenue, Major Customer [Line Items]
Ownership percentage in subsidiary	49.00%
State Street Bank [Member]
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%
State Street Bank [Member] | KPO [Member]
Revenue, Major Customer [Line Items]
Concentration of sales by customer	14.50%	15.50%