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ACCOUNTS AND NOTES RECEIVABLE
6 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
ACCOUNTS AND NOTES RECEIVABLE

(E) ACCOUNTS AND NOTES RECEIVABLE

Accounts and notes receivable have been shown net of the allowance for doubtful accounts of $9.0 million and $7.1 million at September 30, 2015 and March 31, 2015, respectively. We perform ongoing credit evaluations of our customers’ financial condition and generally require no collateral from our customers. The allowance for non-collection of receivables is based upon analysis of economic trends in the construction and oil and gas industries, detailed analysis of the expected collectability of accounts receivable that are past due and the expected collectability of overall receivables. Based on this analysis, we increased our allowance for doubtful accounts approximately $2.0 million in recognition of the downturn in our oil and gas proppants business and potential financial impact of this downturn to our customers.  We have no significant credit risk concentration among our diversified customer base.

We had notes receivable totaling approximately $3.2 million at September 30, 2015, of which approximately $0.5 million has been classified as current and presented with accounts receivable on the balance sheet. We lend funds to certain companies in the ordinary course of business, and the notes bear interest, on average, at LIBOR plus 3.5%. Remaining unpaid amounts, plus accrued interest, mature on various dates between 2015 and 2017. The notes are collateralized by certain assets of the borrowers, namely property and equipment, and are generally payable monthly. We monitor the credit risk of each borrower by focusing on the timeliness of payments, review of credit history and credit metrics and interaction with the borrowers.