Basis of Statement Presentation Level 2 (Policies)	3 Months Ended
Basis of Statement Presentation Level 2 (Policies)	Oct. 31, 2013
BASIS OF STATEMENT PRESENTATION [Abstract]
Revenue Recognition	Under the terms of our sales agreements with customers, we recognize revenue when risk of loss and title are transferred. An invoice is generated upon shipment that sets the fixed and determinable price. Trade promotion reserves are provided for sales incentives made directly to consumers, such as coupons, and made to customers, such as slotting, discounts based on sales volume, cooperative marketing programs and other arrangements. Such trade promotion costs are netted against sales. Sales returns and allowances are not material.
Selling, General and Administrative Expenses	Selling, general and administrative expenses include salaries, wages and benefits associated with staff outside the manufacturing and distribution functions, all advertising and marketing-related costs, any miscellaneous trade spending expenses not required to be included in net sales, research and development costs, depreciation and amortization related to assets outside the manufacturing and distribution process and all other non-manufacturing and non-distribution expenses.
Trade Receivable	We evaluate our allowance for doubtful accounts utilizing a combination of historical experience and periodic review of our accounts receivable aging and specific customer account analysis. A customer account is determined to be uncollectible when we have completed our internal collection procedures, including termination of shipments, direct customer contact and formal demand of payment.
Overburden Removal and Mining Costs	As part of our overall operations, we mine sorbent materials on property that we either own or lease. A significant part of our overall mining cost is incurred during the process of removing the overburden (non-usable material) from the mine site, thus exposing the sorbent material used in a majority of our production processes. These stripping costs are treated as a variable inventory production cost and are included in cost of sales in the period they are incurred. The pre-production overburden removal costs associated with opening a new mine are deferred as prepaid expense and amortized. Additionally, it is our policy to capitalize the purchase cost of land and mineral rights, including associated legal fees, survey fees and real estate fees. The costs of obtaining mineral patents, including legal fees and drilling expenses, are also capitalized. Pre-production development costs on new mines and any prepaid royalties that may be offset against future royalties due upon extraction of the minerals are also capitalized. All exploration related costs are expensed as incurred.
Reclamation	We perform ongoing reclamation activities during the normal course of our overburden removal. As overburden is removed from a mine site, it is hauled to previously mined sites and is used to refill older sites. This process allows us to continuously reclaim older mine sites and dispose of overburden simultaneously, thereby minimizing the costs associated with the reclamation process.

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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Disclosure of accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs.

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