Intangible Assets (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Jul. 31, 2012	Oct. 31, 2012 Technologies [Member]	Jul. 31, 2012 Technologies [Member]	Oct. 31, 2012 Customer relationships [Member]	Jul. 31, 2012 Customer relationships [Member]	Oct. 31, 2012 Trademarks and other [Member]	Jul. 31, 2012 Trademarks and other [Member]
Weighted average amortization period				11 years 8 months 12 days	11 years 8 months 12 days	10 years 0 months 0 days	10 years 0 months 0 days	20 years 0 months 0 days	20 years 0 months 0 days
Gross carrying amount	$ 83,269,000		$ 83,669,000	$ 47,494,000	$ 47,694,000	$ 29,831,000	$ 29,931,000	$ 5,944,000	$ 6,044,000
Accumulated amortization	46,018,000		44,836,000	30,906,000	30,321,000	12,869,000	12,231,000	2,243,000	2,284,000
Net carrying amount	37,251,000		38,833,000	16,588,000	17,373,000	16,962,000	17,700,000	3,701,000	3,760,000
Amortization of intangibles	1,582,000	1,719,000
Amortization Expense - Year One	6,327,000
Amortization Expense - Year Two	6,285,000
Amortization Expense - Year Three	6,211,000
Amortization Expense - Year Four	4,962,000
Amortization Expense - Year Five	$ 4,782,000