Expressions (phrases, clauses, etc.), Noun which may take the genitive case particle 'no'
perfect; complete; thorough; leaving nothing to be desired; more than satisfactory
そのレストランのサービスは至れり尽くせりだった。The restaurant gave us perfect service.
Also written 至れり尽せり【いたれりつくせり】、至れりつくせり【いたれりつくせり】