Kmart's main rival is Woolworths-owned Big W, which lifted profit by 20% in the first half to $129.2 million. Wesfarmers, which appointed a new boss of supermarkets last month, is looking for a new manager for Kmart after outgoing chief Larry Davis' decision to retire at the end of next month. In the interim, Kmart will be run by Mark Goddard, who is in charge of merchandise at the chain.