I've got it.
I don't know why the former doesn't work but the following does.
kendo.drawing.drawDOM($("#Grid"),
{
allPages: true,
avoidLinks: true,
paperSize: ["1300mm", "200mm"],
margin: { top: "2cm", left: "1cm", right: "1cm", bottom: "1cm" },
landscape: true,
template: $("#page-template").html()
}).then(function (documentgroup) {
// Generate PDF file
kendo.drawing.pdf.saveAs(documentgroup, fileName);
});
I inserted that code in the click handler function, where I was previously calling
$("#breakDetailsGrid").data("kendoGrid").saveAsPDF();
Still tweaking it but at least I have my footer.
Thanks for the help!