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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments including both interest and principal payments.

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The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Fixed interest rate related to the interest rate derivative.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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LONG-TERM DEBT (Details) (USD $)					6 Months Ended		12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended
LONG-TERM DEBT (Details) (USD $)	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2011 Term loan credit agreement	Mar. 31, 2011 Term loan credit agreement	Sep. 30, 2011 Term loan credit agreement Tranche 2 Term Lenders	Sep. 30, 2011 Capital leases and installment payment Y	Mar. 31, 2011 Capital leases and installment payment Y	Sep. 30, 2011 Software license liabilities payable	Mar. 31, 2011 Software license liabilities payable	Sep. 30, 2011 Other debt and long-term liabilities	Mar. 31, 2011 Other debt and long-term liabilities	Sep. 30, 2011 Revolving credit facility	Sep. 30, 2011 Tranche 1 Term Lenders	Sep. 30, 2011 Tranche 2 Term Lenders	Jul. 31, 2011 Interest rate swap	Sep. 30, 2011 Interest rate swap	Mar. 31, 2009 Interest rate swap	Jul. 25, 2011 Interest rate swap
Long-term debt
Total long-term debt and capital leases	$ 312,783,000	$ 422,238,000	$ 252,000,000	$ 355,000,000		$ 38,539,000	$ 43,195,000	$ 4,194,000	$ 4,686,000	$ 18,050,000	$ 19,357,000
Less current installments	27,826,000	27,978,000
Long-term debt, excluding current installments	284,957,000	394,260,000
Long-term debt stated interest rate percentage, minimum (as a percent)						3.00%	3.00%
Long-term debt stated interest rate percentage, maximum (as a percent)						8.00%	8.00%
Long-term debt effective interest rate percentage, minimum (as a percent)								4.00%	4.00%
Long-term debt effective interest rate percentage, maximum (as a percent)								7.00%	7.00%
Maximum remaining maturity period of debt (in years)						12	12	3	3
Aggregate amount of borrowing commitment												120,000,000
Required quarterly installment payments					1,500,000
Final payment of long-term debt due March 15, 2015					232,500,000
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	LIBOR	LIBOR
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)			3.70%
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)																	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)																0.25%
Fair market value of the derivative at inception																0	0	0
Unrealized loss of the derivative recorded in other comprehensive income (loss)																$ 1,200,000