FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Fair value measured on a recurring basis Significant Unobservable Inputs (Level 3)	Mar. 31, 2012 Fair value measured on a recurring basis Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Fair value measured on a recurring basis Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2012 Fair value measured on a recurring basis Fair Value, Inputs, Level 2 [Member]	Jul. 01, 2015 Aviation Network Services, LLC [Member]	Jul. 01, 2014 Aviation Network Services, LLC [Member]	Jul. 01, 2013 Aviation Network Services, LLC [Member]	Oct. 31, 2011 Aviation Network Services, LLC [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]
Fair value of assets measured on a recurring basis
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ (2,471)	$ (2,870)	$ (2,471)	$ (2,019)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, Sales, Issues, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(452)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(2,019)	(2,870)	(2,471)	(2,019)
Contingent consideration										(1,926)
Business Acquisition, Contingent Consideration, Potential Cash Payment							1,000	900	1,100		0	3,000
Derivative Asset, Fair Value, Gross Asset					152	(212)
Notional Amount of Foreign Currency Derivatives	6,736
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(37)	232
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	85	(232)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (94)