You are misdiagnosing the problem. The problem isn't the require. It's where you try to use the details function. For example, both of these will work:

my $p = 'Foo::Bar';
eval "require $p";
print $p->details->{name};

# ... and ...

my $p = 'Bar';
eval "require Foo::$p";
print "Foo::$p"->details->{name};
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By merging Foo:: directly into your submodules list, we don't need to constantly recreate the full package name each time - it's already created.