CPU idle time is very low in pick hours

Dear Freinds,

When I check into the st06 during our pic hours the idle time is very low.

Even I checked the top 40 CPU processes, the users are as below

<sid>adm

ora<sid>

ora<sid>

ora<sid>

<sid>adm

daaadm

<sid>adm

root

<sid>adm

orapnc

sapadm

root

root

ora<sid>

ora<sid>

root

root

root

Can anyone tell how to analyze further to increase the CPU idle time of the system.

Regards,