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Subsequent event (Details) (USD $)	3 Months Ended
Subsequent event (Details) (USD $)	Jun. 30, 2011
Subsequent Event [Line Items]
Borrowings under credit facility used for acquisition	$ 129,500,000
Acquisition of dynaTrace [Member]
Subsequent Event [Line Items]
Date of subsequent event	Jul. 01, 2011
Cash paid for acquisition	256,000,000
Direct acquisition costs	300,000
Borrowings under credit facility used for acquisition	$ 129,500,000

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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