LONG-TERM DEBT (Details) (USD $)			9 Months Ended			9 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended			9 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2011 Interest rate swap	Jul. 25, 2011 Interest rate swap	Mar. 31, 2009 Interest rate swap	Dec. 31, 2011 Term loan credit agreement	Mar. 31, 2011 Term loan credit agreement	Dec. 31, 2011 Capital leases and installment payment Y	Mar. 31, 2011 Capital leases and installment payment Y	Dec. 31, 2011 Software license liabilities payable Y	Mar. 31, 2011 Software license liabilities payable Y	Dec. 31, 2011 Other debt and long-term liabilities	Mar. 31, 2011 Other debt and long-term liabilities	Dec. 31, 2011 Revolving credit facility
Long-term debt
Total long-term debt and capital leases	$ 284,827,000	$ 422,238,000				$ 225,500,000	$ 355,000,000	$ 37,868,000	$ 43,195,000	$ 4,068,000	$ 4,686,000	$ 17,391,000	$ 19,357,000
Less current installments	27,852,000	27,978,000
Long-term debt, excluding current installments	256,975,000	394,260,000
Long-term debt stated interest rate percentage, minimum								3.00%	3.00%
Long-term debt stated interest rate percentage, maximum								8.00%	8.00%
Long-term debt effective interest rate percentage, minimum										4.00%	4.00%
Long-term debt effective interest rate percentage, maximum										7.00%	7.00%
Maximum remaining maturity period of debt (in years)								12	12	3	3
Aggregate amount of borrowing commitment						600,000,000								120,000,000
Required quarterly installment payments						1,500,000
Final payment of long-term debt due March 15, 2015						207,500,000
Long-term debt variable interest rate description														LIBOR plus a credit spread, or at an alternative base rate or at the Federal Funds rate plus a credit spread
Long-term debt basis spread on variable interest rate (as a percent)	2.75%					3.00%
Weighted-average interest rate on long-term debt (as a percent)						3.80%
Outstanding letters of credit														400,000
Revolving credit facility dividend restrictions amount, maximum														30,000,000
Fixed interest rate payable on swap (as a percent)				0.94%	3.25%
Notional amount of derivative				150,000,000	95,000,000
LIBOR rate (as a percent)			0.42%
Fair market value of the derivative at inception				0	0
Unrealized loss of the derivative recorded in other comprehensive income (loss)			$ (700,000)