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Common Stock and Stock-Based Compensation Plans (Details 2)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Assumptions used to estimate stock options granted to employees    
Expected dividend yield 0.00% 0.00%
Expected volatility, Minimum 47.00% 39.00%
Expected volatility, Maximum 58.00% 56.00%
Risk-free interest rate, Minimum 0.20% 0.20%
Risk-free interest rate, Maximum 1.20% 2.50%
Expected forfeiture (employees) 10.00% 10.00%
Expected forfeiture (executives) 5.00% 5.00%
Contractual term of up to 10 years 10 years
Suboptimal exercise multiple (employees) 2.10% 2.00%
Suboptimal exercise multiple (executives) 2.40% 2.30%