recuresivley chack and create OUs

Hello Guys,
I need help with a PowerShell function that's part of a much larger script.
In general I'm building a script to automate AD user creation, and while there are several of those lying around.. non are as complete as I'm trying to make.
The current step has got me stumped.

Here's a short extract of my current script:

$Path = "C:\PSScript"
$CSVFile = $Path+"\userlist.csv"
$LogFile = $Path+"\usercreation.log.txt"
$Users = Import-Csv $CSVFile
foreach ($User in $Users){
        if ($user.OUCN) {
                $OUSearchString = "LDAP://"+$user.OUCN
                 if (-Not([adsi]::Exists($OUSearchString))){
                   ##NEED HELP HERE##
                  }
}

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So basically, I was going to check if the OU in question exists in the AD and create it if not, but then It got me thinking, What if the OU in question is in Essence a Sub-OU and the part OU Doesn't exist either.

For Example, Lets Assume $user.OUCN returns "OU=Junior,OU=QA,OU=Software,OU=IL,DC=mydom,DC=local"
And only "OU=IL,DC=mydom,DC=local" exists in my AD.. In that case, will the following command:
New-ADOrganizationalUnit -Name Junior -Path "OU=QA,OU=Software,OU=IL,DC=mydom,DC=local" throw and error? or will it automatically create the parent OU(s) first.
If it's the latter, How can I build a PS function that will take an entire OUCN value and make sure it exists before I try to put a user into it?