Meaning of numbers inside parentheses in Lattice Synthesis Engine Utilization Report?

I’m using Lattice Radiant 2.0 to synthesize a design. In the "Synthesis Utilization Report file", I see the following line:

                  LUT4    PFU Registers   IO Buffers   DSPMULT     EBR   Carry Cells
 toplevel    2752(267)          702(74)       22(21)      5(0)   30(2)      315(315)

The numbers outside the parentheses are pretty clear; that’s just resource usage.

My questions:

• What do the numbers inside the parentheses mean?
• Is this standard notation for synthesizer outputs? If so, where can I find information explaining standard synthesizer output notation?

I’ve already looked through the following documents, but haven’t been able to find anything (warning: links auto-download PDFs (Lattice’s decision, not mine.))

• Lattice synthesis engine user guide
• Lattice Radiant Software 2.0 User Guide
• Lattice Radiant Software 2.0 Help
• Lattice Radiant Software 2.0 Tutorial

My only guess is that the number in parentheses describes how many resources could be optimized out of the design with more aggressive optimization strategies, but I have nothing to base that guess off of.