it doesn't take a rocket scientist to (do something)

it is easy to understand something.

It doesn't take a rocket scientist to understand that fewer and fewer schools can afford to maintain competitive athletic programs.

Usage notes: sometimes used in the form it's not rocket science:

A five year old could put this puzzle together — it's not rocket science.

• up to the minute
• up to your neck in
• up to your neck in something
• up to your old tricks
• up your alley
• up your sleeve
• use a sledgehammer to crack a nut
• used to
• used to doing something
• used to do something
• used to something
• Use loaf.
• use something to good account
• use to good account
• use up
• use up something
• Use your loaf.
• usher in
• usher in something
• usher someone in
• vanish into thin air
• vanish off the face of the earth
• Variety is the spice of life.
• vent spleen
• vent your spleen