Fair Value Measurements (Details 2) - Recurring basis - USD ($)	Jul. 31, 2015	Jul. 31, 2014
Assets:
Total assets	$ 1,680,000	$ 1,702,000
Liabilities:
Total accrued expenses	578,000	753,000
Contingent consideration	751,000	2,722,000
Total other long-term liabilities	1,448,000	2,463,000
Total liabilities	2,777,000	5,938,000
Accrued expenses
Liabilities:
Assumed contingent obligation	12,000
Contingent guaranteed obligation	566,000	684,000
Other long-term liabilities
Liabilities:
Assumed contingent obligation	1,126,000	1,752,000
Contingent guaranteed obligation	322,000	711,000
Interest rate swap agreements | Accrued expenses
Liabilities:
Interest rate swap agreement		69,000
Money markets | Cash and cash equivalents
Assets:
Money markets	1,680,000	1,702,000
Level 1
Assets:
Total assets	1,680,000	1,702,000
Level 1 | Money markets | Cash and cash equivalents
Assets:
Money markets	1,680,000	1,702,000
Level 2
Liabilities:
Total accrued expenses		69,000
Total liabilities		69,000
Level 2 | Interest rate swap agreements | Accrued expenses
Liabilities:
Interest rate swap agreement		69,000
Level 3
Liabilities:
Total accrued expenses	578,000	684,000
Contingent consideration	751,000	2,722,000
Total other long-term liabilities	1,448,000	2,463,000
Total liabilities	2,777,000	5,869,000
Level 3 | Accrued expenses
Liabilities:
Assumed contingent obligation	12,000
Contingent guaranteed obligation	566,000	684,000
Level 3 | Other long-term liabilities
Liabilities:
Assumed contingent obligation	1,126,000	1,752,000
Contingent guaranteed obligation	$ 322,000	$ 711,000