Revenue and Contract Receivables, net (Details) (USD $)	3 Months Ended				6 Months Ended										3 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2014		Jan. 31, 2013		Jul. 31, 2013	Jan. 31, 2014 United States, Canada and South America [Member]	Jul. 31, 2013 United States, Canada and South America [Member]	Jan. 31, 2014 Middle East, Africa [Member]	Jul. 31, 2013 Middle East, Africa [Member]	Jan. 31, 2013 Middle East, Africa [Member]	Jan. 31, 2014 Middle East, Africa Projects [Member]	Jan. 31, 2013 Middle East, Africa Projects [Member]	Oct. 31, 2012 Middle East, Africa Projects [Member]	Jan. 31, 2014 Asia [Member]	Jul. 31, 2013 Asia [Member]	Jan. 31, 2013 China
Contracts Receivable [Line Items]
Billed Contracts Receivable	$ 27,644,990				$ 27,644,990				$ 36,284,950
Unbilled Contracts Receivable	18,924,920				18,924,920				16,441,857
Contracts Receivable, Gross	46,569,910				46,569,910				52,726,807	38,407,797	41,302,180	7,831,384	10,876,151	3,400,000			20,300,000	330,729	548,476	7,000,000
Contract receivables (in hundredths)	18.00%				18.00%				22.00%
Allowance for doubtful accounts receivables (in hundredths)	69.00%				69.00%				72.00%
Allowance for doubtful accounts and contract adjustments	(5,336,972)		(10,216,404)		(5,336,972)		(10,216,404)			1,672,238	1,576,746	3,535,188	3,886,508					129,546	129,546	2,100,000
Total contract receivables, net	41,232,938				41,232,938				47,134,007
Contractual retainage balance included under billed contract receivable	0				0				0
Management anticipation for receivables collection	1 year				1 year
Cash received related to a project															2,400,000	7,100,000
Reduction in allowance for doubtful accounts and contract adjustments															600,000	1,700,000
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	5,639,291		11,322,000		5,592,800		10,238,391			(1,672,238)	(1,576,746)	(3,535,188)	(3,886,508)			(7,400,000)		(129,546)	(129,546)	(2,100,000)
Net increase (decrease) due to adjustments in the allowance for contract adjustments (1)	(288,131)	[1]	(836,024)	[1]	(258,403)	[1]	236,067	[1]
Net increase (decrease) due to adjustments in the allowance for doubtful accounts (2)	(11,688)	[2]	(269,072)	[2]	12,575	[2]	(258,054)	[2]
Net increase (decrease) due to adjustments in the allowance for Transfer of reserves to allowance for project disallowances	(2,500)	[3]	(500)	[3]	(10,000)	[3]	0	[3]
Balance at end of period	$ 5,336,972		$ 10,216,404		$ 5,336,972		$ 10,216,404			$ (1,672,238)	$ (1,576,746)	$ (3,535,188)	$ (3,886,508)					$ (129,546)	$ (129,546)	$ (2,100,000)

[1] Increases (decreases) to the allowance for contract adjustments on the condensed consolidated balance sheets are recorded as (decreases) increases to revenue on the condensed consolidated statements of operations.

[2] Increases (decreases) to the allowance for doubtful accounts on the condensed consolidated balance sheets are recorded as increases (decreases) to administrative and other indirect operating expenses on the condensed consolidated statements of operations.

[3] Refer to Note 11 of these condensed consolidated financial statements for a summary of the allowance for project disallowances.