Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jan. 31, 2015	Jul. 31, 2014
Current assets:
Cash and cash equivalents	$ 5,877,084	$ 6,889,243
Investment securities available for sale	1,445,810	1,407,277
Contract receivables, net of allowance for doubtful accounts and contract adjustments of $5,966,241 and $6,126,854, respectively	41,949,148	44,431,305
Deferred income taxes	4,561,310us-gaap_DeferredTaxAssetsNetCurrent	4,534,437us-gaap_DeferredTaxAssetsNetCurrent
Income tax receivable	675,311us-gaap_IncomeTaxesReceivable	1,107,983us-gaap_IncomeTaxesReceivable
Other current assets	1,972,674us-gaap_OtherAssetsCurrent	1,589,646us-gaap_OtherAssetsCurrent
Total current assets	56,481,337us-gaap_AssetsCurrent	59,959,891us-gaap_AssetsCurrent
Property, building and equipment, net of accumulated depreciation of $24,674,231 and $28,615,915, respectively	7,524,186us-gaap_PropertyPlantAndEquipmentNet	7,941,455us-gaap_PropertyPlantAndEquipmentNet
Deferred income taxes	1,867,385us-gaap_DeferredTaxAssetsNetNoncurrent	1,865,798us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	1,994,457us-gaap_OtherAssetsNoncurrent	1,941,178us-gaap_OtherAssetsNoncurrent
Total assets	67,867,365us-gaap_Assets	71,708,322us-gaap_Assets
Current liabilities:
Accounts payable	8,038,605us-gaap_AccountsPayableCurrent	9,874,649us-gaap_AccountsPayableCurrent
Lines of credit	1,324,857	1,572,466
Accrued payroll costs	8,257,922	7,650,077
Current portion of long-term debt and capital lease obligations	503,022	420,737
Billings in excess of revenue	5,096,816us-gaap_BillingsInExcessOfCostCurrent	5,003,413us-gaap_BillingsInExcessOfCostCurrent
Other accrued liabilities	3,950,861us-gaap_OtherAccruedLiabilitiesCurrent	4,235,262us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities	27,172,083us-gaap_LiabilitiesCurrent	28,756,604us-gaap_LiabilitiesCurrent
Income taxes payable	107,035us-gaap_AccruedIncomeTaxesNoncurrent	107,035us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income taxes	372,306	631,083
Long-term debt and capital lease obligations	284,436	421,769
Commitments and contingencies (Note 15)
Shareholders' equity:
Preferred stock, par value $.01 per share (2,000,000 shares authorized; no shares issued)	0us-gaap_PreferredStockValueOutstanding	0us-gaap_PreferredStockValueOutstanding
Capital in excess of par value	16,978,315us-gaap_AdditionalPaidInCapital	17,124,339us-gaap_AdditionalPaidInCapital
Retained earnings	21,578,333	21,916,575
Accumulated other comprehensive loss	(1,038,407)	(182,735)
Treasury stock, at cost (Class A common: 40,553 shares; Class B common: 64,801 shares)	(1,223,899)us-gaap_TreasuryStockValue	(1,223,899)us-gaap_TreasuryStockValue
Total Ecology and Environment, Inc. shareholders' equity	36,338,280us-gaap_StockholdersEquity	37,678,218us-gaap_StockholdersEquity
Noncontrolling interests	3,593,225us-gaap_MinorityInterest	4,113,613us-gaap_MinorityInterest
Total shareholders' equity	39,931,505	41,791,831
Total liabilities and shareholders' equity	67,867,365	71,708,322
Class A [Member]
Shareholders' equity:
Common stock	26,997	26,851
Class B [Member]
Shareholders' equity:
Common stock	$ 16,941	$ 17,087

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Carrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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