The jurists of Madinah (may Allah have mercy on them) used to say: Whoever forgot to perform Tawaf al-Ifadah until he returned to his own land is in a state of ihram again from the time he remembers it, until he comes to the House and performs Tawaf. If he has relations with women, he must sacrifice a camel (badanah).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9650