Fair Value (Details 3) (Contingent Consideration Earn Out Liability [Member], Vortex Medical [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2012
Contingent Consideration Earn Out Liability [Member] \| Vortex Medical [Member]
Summary showing reconciliation of the contingent payments
Balance, May 31, 2012	$ 0
Purchase price contingent consideration	60.3
Contingent payments
Change in fair value of contingent consideration	0.2
Balance, November 30, 2012	$ 60.5

Fair value measurement with unobservable inputs reconciliations recurring basis change in fair value of contingent consideration.

No definition available.

Name:	ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisChangeInFairValueOfContingentConsideration
Namespace Prefix:	ango_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration