Gross profit margin increased to 20.2% of net sales for the third quarter of fiscal 2020 from 19.2% for the third quarter of fiscal 2019. Gross profit increased by $4.0 million in the quarterly comparison. The increases in gross profit margin and gross profit were primarily attributable to increased sales volume, manufacturing efficiencies and reduced manufacturing spending per produced pound.
Gross profit margin for the first three quarters of fiscal 2020 increased to 20.0% of net sales from 17.4% for the first three quarters of fiscal 2019. Gross profit increased by $20.4 million. The increases in gross profit and gross profit margin were mainly due to the factors cited in the quarterly comparison and lower acquisition costs for cashews and pecans.
Total operating expenses, as a percentage of net sales, decreased to 11.1% for the third quarter of fiscal 2020 from 11.6% for the third quarter of fiscal 2019 due to a higher net sales base. Total operating expenses were unchanged as increases in expenses for incentive compensation, product donations to food banks and broker commissions were fully offset by decreases in legal, consulting, freight and advertising expenses coupled with the recognition of a $0.7 million gain from the initial insurance recovery related to a fire in our Garysburg, North Carolina facility, which occurred in the second quarter of fiscal 2020.
Total operating expenses for the first three quarters of fiscal 2020 decreased to 10.7% of net sales from 11.0% of net sales for the first three quarters of fiscal 2019 due to a higher net sales base. Total operating expenses decreased by $0.4 million as increases in expenses for incentive compensation, product donations to food banks and broker commissions were more than offset by decreases in legal, consulting, freight and advertising expenses and the gain from the insurance recovery noted in the quarterly comparison.
Interest expense for the current third quarter declined to $0.6 million from $0.8 million for the third quarter of fiscal 2019. For the first three quarters of fiscal 2020, interest expense declined to $1.5 million from $2.5 million for the first three quarters of fiscal 2019. The decrease in interest expense in the quarterly comparison resulted from lower interest rates, and the decrease in interest expense in the year to date comparison came from lower average debt levels and lower interest rates.
The value of total inventories on hand at the end of the current third quarter increased by $9.6 million, or 5.4%, when compared to the value of total inventories on hand at the end of the third quarter of fiscal 2019. The increase in the value of total inventories was primarily due to increased quantities of peanuts, cashews, almonds, pistachios andwork-in-process inventory. The weighted average cost per pound of raw nut and dried fruit input stocks on hand increased by 3.4% due to increased acquisition costs for walnuts and higher quantities of tree nuts.
“The third quarter of fiscal 2020 marks the fifth consecutive quarter in which we reported record net income and diluted earnings per share. As was the case in recent quarters, the record results were driven by strong sales volume growth in our consumer distribution channel. As part of our strategy of increasing consumer sales, I am happy to report that sales volume in the consumer distribution channel accounted for approximately 70% of our total sales volume in the current third quarter. The increase in sales volume in the consumer distribution channel was driven mainly by increased sales of private brand products, the majority of which occurred with existing customers. Increased sales forFisher snack nuts,Orchard ValleyHarvest produce products andSouthern StyleNuts snack mixes also contributed to the sales volume growth in the consumer distribution channel,” noted Jeffrey T. Sanfilippo, Chief Executive Officer. “At retail,Fisher recipe nut pound volume declined by 23% for the same reason that resulted in the sales volume decline, while the total category pound
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