Product Warranties - Additional Information (Detail)	6 Months Ended
	Jan. 31, 2014
Minimum [Member]
Product Warranty Disclosure [Line Items]
Cost of satisfying warranty claims	0.50%
Maximum [Member]
Product Warranty Disclosure [Line Items]
Cost of satisfying warranty claims	1.00%
Cortelco Products [Member] | Minimum [Member]
Product Warranty Disclosure [Line Items]
Products Warranty Period	1 year
Cortelco Products [Member] | Maximum [Member]
Product Warranty Disclosure [Line Items]
Products Warranty Period	5 years
Cspr Products [Member] | Minimum [Member]
Product Warranty Disclosure [Line Items]
Products Warranty Period	1 year
Cspr Products [Member] | Maximum [Member]
Product Warranty Disclosure [Line Items]
Products Warranty Period	5 years