Is it safe not to close a Java Scanner, provided I close the underlying readable?

If I have a method that takes a reader and I want to operate on the reader with a Scanner like so:

Scanner scanner = new Scanner(reader);
while(scanner.hasNext()) {
    //blah blah blah
}

Is it safe not to close scanner? Documentation says that it "closes this scanner" and then talks about closing the underlying readable. Suppose I don't want to close the readable and instead want the caller to close reader when ready. Is it safe not to close scanner here?