I think in this specific case the Creditors-SegmentsHypercube_cfwd_31_10_2017_Set1 context relates to the £25,236 creditors figure in the BS and references the dimension "ns5:FinancialInstrumentCurrentNon-currentDimension" which identifies the creditors as short term creditors (CurrentFinancialInstruments) and the related accounting period - 2017-10-31.
Similarly, the CreditorsHypercube_cfwd_31_10_2016_Set1 context refers to the £17,319 figure in the BS and references the same dimension but relates to the accounting period 2016-10-31
The the content of iXBRL is not defined by Companies House. The specification is here: https://specifications.xbrl.org/spec-group-index-inline-xbrl.html. You may need to seek expert advise interpreting the iXBRL as applied to company accounts, which is not something I can offer.