Overall it looks pretty easy to explain, such that one doesn't need to leap that far.
For example, if you build your costs for a $2.4 to $2.5 billion sales run-rate, generating $80m in net income, which is what they did for fiscal 2015. Then, you drop sales to $2 billion instead (which is now where they're at), while not reducing their operating expenses (which actually went up slightly), you get a big fat loss.
I'd attribute their mess to a wildly incompetent management and board, most of which should probably be thrown out of the company immediately. The crazy stock valuation is the sole thing keeping that from happening now; reality will catch up to that however as it almost always does. When the hammer does come down on the stock, activists will start shaking the company for changes.
The 30 million share repurchase program they proclaimed a little over a year ago, is equal to about a $3 billion cost in today's stock price. They're losing a lot of money, and they have $1.7 billion in cash in the bank, with a negative balance sheet. Then consider the zero growth for a decade and the poor prospects for turning that around near-term. Management & the board are doing something extraordinarily egregious and a large number of Autodesk employees are going to get hurt in the coming years most likely (very tragically). I can't see a scenario where Autodesk doesn't have to slash a further 1/4 to 1/3 of their staff in the next few years (they have to cut deep to get back to even on net income). When the bloom comes off this stock market bubble, their $109 stock will be a $20 or $30 stock if they don't quickly find a way to drive growth again.