Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Russian Tax Authority
Loss Contingencies [Line Items]      
Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations $ 13,028    
Guarantee obligations secured by cash deposits 1,426    
Guarantee obligations represented by a reduction of the available amount of the company's short term and long term revolving lines of credit 11,602    
Cash deposits pledged as collateral on performance bonds and letters of credit 1,426 1,307  
Indian Custom Bonds Outstanding 3,871    
Payments for legal settlements     $ 140