to make payments, additional allowances may be required that could adversely affect our operating results. This risk is heightened during periods when economic conditions worsen, such as the when the worldwide economy is experiencing a significant downturn. The financial turmoil that affected the banking system and financial markets and increased the risk that financial institutions mighty consolidate or go out of business resulted in a tightening in the credit markets, a lower than normal level of liquidity in many financial markets, and extreme volatility in fixed income, credit, currency and equity markets. There could be a number of follow-on effects from this type of credit crisis on our business, including inability of customers, including channel partners, to obtain credit to finance purchases of our products and/or customer, insolvencies and failure of financial institutions, which could negatively impact our financial results. Furthermore, there can be no assurance that we will be able to continue to obtain credit insurance in the future.



As of January 31, 2010, our allowance for doubtful accounts receivable was $1.0 million and our gross accounts receivable balance was $414.0 million. Of the $414.0 million, $95.9 million was covered by credit insurance and $15.8 million was covered by letters of credit. If the financial condition of our customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required and we may have to record additional reserves or write-offs on certain sales transactions in the future. Factors impacting the allowance include the level of gross receivables, the financial condition of our customers and the extent to which balances are covered by credit insurance or letters of credit. We have incurred cumulative bad debts of $0.5 million over the last three fiscal years.  As a result of our low bad debt experience, our allowance for doubtful accounts receivable has ranged between 0.1% and 0.3% during fiscal years 2010 and 2009, respectively. As of January 31, 2010, our allowance for doubtful accounts receivable represented 0.2% of our gross accounts receivable balance.

 

Inventories

   

Inventory cost is computed on an adjusted standard basis; which approximates actual cost on an average or first-in, first-out basis. We write down our inventory for estimated lower of cost or market, obsolescence or unmarketable inventory equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand, future product purchase commitments, estimated manufacturing yield levels and market conditions. If actual market conditions are less favorable than those projected by management, or if our future product purchase commitments to our suppliers exceed our forecasted future demand for such products, additional future inventory write-downs may be required that could adversely affect our operating results. Inventory reserves once established are not reversed until the related inventory has been sold or scrapped, so if actual market conditions are more favorable in the fiscal periods subsequent to that in