Debt Description (Details) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012 Bank Of America And Wells Fargo Facilities [Member] Third Amendment [Member] USD ($)	Jun. 30, 2012 Wells Fargo Facility [Member] GBP (£)
Current Borrowing Capacity	$ 150,000
Maximum Borrowing Capacity		£ 12,500
Initiation Date	November 1, 2011	November 5, 2010
Termination Date	November 1, 2016	The sterling revolving credit facility is for a three year term with interest paid at the end of the applicable one month, three month or six month interest period.
Covenant Terms	The Credit Agreement contains financial covenants, including a fixed charge ratio and a funded debt to EBITDA ratio.	The facility contains financial covenants requiring Centaur to maintain a minimum tangible net worth of £3,000.
Interest Rate at Period End	1.12%	1.65%
Interest Rate Description	Under the Third Amendment, the margin on variable interest rate borrowings now ranges from 0.95% to 1.50%.	Interest is based on LIBOR for the applicable interest period plus an applicable margin of 1.05% to 1.90%.
Commitment Fee Description	The Third Amendment also reduced the commitment fee from a range of 0.2% to 0.35% to a range of 0.15% to 0.25% depending on the funded debt to EBITDA ratio.