If you have a Solution Manager system you can create a MOpz transaction (or your Basis team can) and it will calculate all the needed files and add them into the download basket (of the person who started MOpz); it will also then provide a stack file specific to your system and then you provide the stack file to JSPM or SUM (depends on the version of NW, I suggest using SUM as JSPM updates have started to break that tool, as Matt Pollicove can attest too).
If Solution Manager is not an option, you get to do this the hard way (again Matt Pollicove can attest to this pain). You will have to log into the service market and manually download all the IDM and Java application components and proceed to update the system without the stack file using JSPM/SUM.
Why do I need to update the Java components, its due to pre-reqs for some of the IDM SPs to be applied successfully; I believe IDM Federation SP08 requires a stack level release of 10 for NW 7.3 and a stack level release of 6 for NW 7.31.