This is the output of an AIX LPAR (logical partition, a kind of virtual machine) and therefore the explanations before - while being correct for physical machines - are not really true.
The IBMs p-Series (this is the sole hardware to support AIX) hypervisor dynamically adjusts the layout of the system depending on its own load, the load of other LPARs on the same "managed system" (the IBM-speak for "hardware node", physical system) and the LPARs profile parameters, therefore the single presentation of some sar-output without any accompanying information is next to useless.
First off, the OS version seems to be 5.3, which is out of support for nearly 2 years now. I suggest to update ASAP.
Post an output of
vmstat -tw 1 while the system is under a typical load. Notice that "%usr", "%sys", "%idle" and "%wait" are only relative to "ecc" (entitled capacity comsumed). For example a 50% usr with an ecc of 0.1 means that the system is exerting effectively 5% of the processor ressources it could muster on user processes. It further means the system has 10% of its processor possible resources allocated but the hypervisor doesn't see the need to give it more right now.
We will also need to know which hardware your managed system is (Power5, Power6, Power6+, Power7, Power7+ or Power8), the LPAR profile you booted from and let us see from there. You might need to post additional information before any verdict is possible.
You might want to read
this thread in the meantime for a short explanation on analyzing vmstat-output.
I hope this helps.
bakunin