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Telling calibre that an item such as genre is hierarchical only changes how it is displayed. It does not change the "name" of the item. For example, "Police Detective.Inspector Wexford" is a single item, not two. The same for "Police Detective.Inspector Morse". In this case there is no item named "Police Detective" that you can rename, which is why you are not offered the rename option when you click on "Police Detective". When you rename a lowest-level item you can change any part of the name including any parts before dots.
If you wish to rename all genres that begin with "Police Detective" to something else then you should use bulk metadata edit / search & replace. That will let you change all genres that begin with "Police Detective" to whatever you want.
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