Concentrations, Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Feb. 12, 2014	Apr. 30, 2014	Apr. 30, 2013	Feb. 14, 2014	Jul. 31, 2013
Loss Contingencies [Line Items]
Total accounts receivable		30.00%	42.00%
Total revenue		36.00%	42.00%
Commitment for inventory purchases		$ 1,814,000
Accounts receivable and inventories		1,000,000
Interest rate of loan		4.00%
Trade accounts receivable		800,000
Interest Rate Base		2.00%
Income Tax Examination Possible Losses		320,000
Income Tax Examination Possible Losses Including Interest And Penalties				559,807
Income Tax Examination, Penalties and Interest Accrued, Total					96,000
Payments for legal settlements	559,807
Loss contingency, period of occurrence	March 27, 2014
Litigation settlement, amount	320,000
Additional liability recorded		224,000
Borrowings on lines of credit		$ 0			$ 0
Cortelco Systems Puerto Rico [Member]
Loss Contingencies [Line Items]
Line of credit, expiration date		Dec. 15, 2014
Agreement expiration period		Nov. 30, 2014
Customer One [Member]
Loss Contingencies [Line Items]
Total accounts receivable		11.00%	16.00%
Total revenue		11.00%	17.00%
Customer Two [Member]
Loss Contingencies [Line Items]
Total accounts receivable		7.00%	9.00%
Total revenue		10.00%	14.00%
Customer Three [Member]
Loss Contingencies [Line Items]
Total accounts receivable		6.00%	9.00%
Total revenue		8.00%	7.00%
Customer Four [Member]
Loss Contingencies [Line Items]
Total accounts receivable		6.00%	8.00%
Total revenue		7.00%	4.00%