Product Warranties - Additional Information (Detail)	3 Months Ended
	Oct. 31, 2013
Products Warranty Period	1 year
Maximum [Member]
Cost of satisfying warranty claims	1.00%
Minimum [Member]
Cost of satisfying warranty claims	0.50%
Cortelco Products [Member] | Maximum [Member]
Products Warranty Period	5 years
Cortelco Products [Member] | Minimum [Member]
Products Warranty Period	1 year