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Income Taxes (Details) (USD $)	Apr. 30, 2011	Jul. 31, 2010
Income Taxes
Total unrecognized tax benefits, excluding interests - Ending and beginning balances	$ 6,853,000	$ 7,056,000
Unrecognized tax benefits that would positively impact Comtech's effective tax rate, if recognized	5,849,000	6,060,000
Income taxes payable non-current	4,914,000	5,220,000
Interest accrued relating to income taxes, net of the related income tax benefit	$ 547,000	$ 580,000

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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