Generally two types of restrictions apply:
1) When the client signs a contract to work with Accenture, they sign up to a clause preventing them from poaching or soliciting staff
2) When an individual signs their employment contract (or equivalent), they sign up to a clause preventing them from working for competitors or immediate clients (i.e. clients that the individual or their group did consulting work for) for a set period
Both restrictions are phrased to as to apply to both direct employment and contracting.
In a case of redundancy, Accenture is likely to take a much more relaxed attitude. Also, individual restrictions are less likely to be enforced for junior staff as long as they're not taking intellectual property with them.