Ref: "Officially separated from service end of Sept"
Speaking about VA compensation entitlement in general: VA compensation begins to accrue the first day of the month following the month having the VA comp effective date.
Effective date VA comp, 28 September 2020 = VA comp would accrue for 1-31 October and if processed in time, paid 30 October since 1 November and 31 October are on the weekend.
Effective date VA comp, 1 October 2020 = VA comp would accrue for 1-30 November and if processed in time, paid on/about 1 December 2020.
The VA processing cycle, cutoff, is around the 19th. If processed before the 19th, the pay shows at end of month or on the first. If processed after the 19th, the pay rolls over to the following month. Per discussions with former and present VA employees on other boards.
How the above fits with those who have been in the IDES is unknown to me.
Good luck,
Ron