Stock Based Compensation and Stock Options (Details 1) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Stock compensation expense for time based options and performance based options
Cost of revenues	$ 91,195,000	$ 81,425,000
General and administrative	12,842,000	12,174,000
Total cost of stock-based compensation included in income before income tax provision	405,000	297,000
Amount of income tax benefit recognized	5,467,000	4,411,000
Diluted	$ 0.40	$ 0.29
Time Based Options [Member] | Performance Shares [Member]
Stock compensation expense for time based options and performance based options
Cost of revenues	136,000	113,000
General and administrative	269,000	184,000
Total cost of stock-based compensation included in income before income tax provision	405,000	297,000
Amount of income tax benefit recognized	(157,000)	(119,000)
Amount charged against net income	$ 248,000	$ 178,000
Diluted	$ (0.01)	$ (0.01)