Other Accrued Liabilities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2016	May 02, 2015	Apr. 30, 2016	May 02, 2015	Apr. 30, 2016	Jan. 30, 2016	Jul. 31, 2015
Other Accrued Liabilities [Abstract]
Allowance for project disallowances	$ 1,818,854	$ 2,242,813	$ 2,242,813	$ 2,393,351	$ 1,818,854	$ 1,818,854	$ 2,242,813
Other					1,548,109		1,688,471
Total other accrued liabilities					$ 3,366,963		$ 3,931,284
Allowance for Project Disallowances [Roll Forward]
Balance at beginning of period		2,242,813	2,242,813	2,393,351
Reduction of settlement estimate recorded in prior periods	0	0	(423,959)	(150,538)
Balance at end of period	$ 1,818,854	$ 2,242,813	$ 1,818,854	$ 2,242,813