The point $P$ on the sphere of radius 3 and centered at the origin has spherical coordinate $\left( 3, \frac{3 \pi}{8}, \frac{\pi}{5} \right).$  Find the spherical coordinates of the point diametrically opposite $P.$  Enter your answer in the form $(\rho,\theta,\phi),$ where $\rho > 0,$ $0 \le \theta < 2 \pi,$ and $0 \le \phi \le \pi.$
The point $P$ is determined by the angles $\theta$ and $\phi,$ as shown below.

[asy]
import three;

size(180);
currentprojection = perspective(6,3,2);

triple sphericaltorectangular (real rho, real theta, real phi) {
  return ((rho*Sin(phi)*Cos(theta),rho*Sin(phi)*Sin(theta),rho*Cos(phi)));
}

triple O, P;

O = (0,0,0);
P = sphericaltorectangular(1,60,45);

draw((-1,0,0)--(1,0,0),Arrow3(6));
draw((0,-1,0)--(0,1,0),Arrow3(6));
draw((0,0,-1)--(0,0,1),Arrow3(6));
draw(surface(O--P--(P.x,P.y,0)--cycle),gray(0.7),nolight);
draw(O--P--(P.x,P.y,0)--cycle);
draw((0,0,0.5)..sphericaltorectangular(0.5,60,45/2)..sphericaltorectangular(0.5,60,45),Arrow3(6));
draw((0.4,0,0)..sphericaltorectangular(0.4,30,90)..sphericaltorectangular(0.4,60,90),Arrow3(6));

label("$x$", (1.1,0,0));
label("$y$", (0,1.1,0));
label("$z$", (0,0,1.1));
label("$\phi$", (0.2,0.25,0.6));
label("$\theta$", (0.6,0.15,0));
label("$P$", P, N);
[/asy]

For the point diametrically opposite $P,$ $\theta' = \theta + \pi$ and $\phi' = \pi - \phi.$

[asy]
import three;

size(180);
currentprojection = perspective(6,3,2);

triple sphericaltorectangular (real rho, real theta, real phi) {
  return ((rho*Sin(phi)*Cos(theta),rho*Sin(phi)*Sin(theta),rho*Cos(phi)));
}

triple O, P, Q;

O = (0,0,0);
P = sphericaltorectangular(1,60,45);
Q = sphericaltorectangular(1,240,135);

draw(surface(O--Q--(Q.x,Q.y,0)--cycle),gray(0.7),nolight);
draw((-1,0,0)--(1,0,0),Arrow3(6));
draw((0,-1,0)--(0,1,0),Arrow3(6));
draw((0,0,-1)--(0,0,1),Arrow3(6));
draw(O--P--(P.x,P.y,0)--cycle);
draw(O--Q--(Q.x,Q.y,0)--cycle);
draw((0,0,0.5)..sphericaltorectangular(0.5,240,135/2)..sphericaltorectangular(0.5,240,135),Arrow3(6));
draw((0.4,0,0)..sphericaltorectangular(0.4,120,90)..sphericaltorectangular(0.4,240,90),Arrow3(6));

label("$x$", (1.1,0,0));
label("$y$", (0,1.1,0));
label("$z$", (0,0,1.1));
label("$\phi'$", (-0.2,-0.4,0.4));
label("$\theta'$", (-0.6,0.25,0));
label("$P$", P, N);
[/asy]

Hence, the spherical coordinates of the point diametrically opposite $P$ are $\left( 3, \frac{3 \pi}{8} + \pi, \pi - \frac{\pi}{5} \right) = \boxed{\left( 3, \frac{11 \pi}{8}, \frac{4 \pi}{5} \right)}.$