LONG-TERM DEBT: (Details) (USD $)			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended							12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2009 Interest rate swap Fiscal 2009 derivative agreement	Jul. 25, 2011 Interest rate swap Fiscal 2009 derivative agreement	Mar. 31, 2012 Interest rate swap July 25, 2011 derivative agreement	Jul. 25, 2011 Interest rate swap July 25, 2011 derivative agreement	Mar. 31, 2012 Term loan credit agreement	Mar. 31, 2011 Term loan credit agreement	Mar. 31, 2012 Capital leases and installment payment obligations Y	Mar. 31, 2011 Capital leases and installment payment obligations Y	Mar. 31, 2012 Software license liabilities payable Y	Mar. 31, 2011 Software license liabilities payable Y	Mar. 31, 2012 Other debt and long-term liabilities	Mar. 31, 2011 Other debt and long-term liabilities	Mar. 31, 2012 Revolving credit facility	Mar. 31, 2012 Revolving credit facility LIBOR	Mar. 31, 2012 Revolving credit facility Alternative base rate	Mar. 31, 2012 Revolving credit facility Federal Funds rate
Long-term debt
Total long-term debt and capital leases	$ 278,222,000	$ 422,238,000					$ 224,000,000	$ 355,000,000	$ 35,726,000	$ 43,195,000	$ 1,768,000	$ 4,686,000	$ 16,728,000	$ 19,357,000
Less current installments	26,336,000	27,978,000
Long-term debt, excluding current installments	251,886,000	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)									10	10	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									LIBOR	Alternative base rate	Federal Funds rate
Long-term debt basis spread on variable interest rate (as a percent)							3.00%									2.75%
Weighted-average interest rate on long-term debt (as a percent)							3.80%
Outstanding letters of credit															2,500,000
Revolving credit facility dividend restrictions amount, maximum															30,000,000
Fixed interest rate payable on swap (as a percent)			3.25%			0.94%
Notional amount of derivative			95,000,000			150,000,000
Description of variable interest rate basis receivable on swap			LIBOR		LIBOR
LIBOR rate (as a percent)					0.56%
Fair market value of the derivative			0	0		0
Unrealized loss of the derivative recorded in other comprehensive income (loss)					$ (1,100,000)