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Michael Jackson 's sexual assault accusers Wade Robson and James Safechuck want a fortune ... MJ's estate says they're seeking $400 million in damages over the alleged abuse.

In new court documents -- obtained by TMZ -- MJ’s estate reveals the eye-popping figure in documents about a dispute with Paris Jackson over payment of their attorneys' fees. Gallery Launch Gallery Getty

Up until this point, no one knew how much Robson and Safechuck were gunning for ... as they continue their lawsuits against Jackson's companies, MJJ Productions and MJJ Ventures. HBO

The estate says it’s buried in paperwork -- currently tied up in at least five litigations and arbitrations. As for Paris ... she’s fighting with the Estate's lawyers over mounting fees after they hired

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