Intangible Assets (Details) - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 361,095,000	$ 82,995,000
Accumulated amortization	76,401,000	62,986,000
Net carrying amount	284,694,000	20,009,000
Amortization of intangibles	13,415,000	$ 6,211,000	$ 6,285,000
Estimated Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization Expense - Year One	22,823,000
Amortization Expense - Year Two	21,075,000
Amortization Expense - Year Three	17,155,000
Amortization Expense - Year Four	17,155,000
Amortization Expense - Year Five	$ 16,196,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	20 years 3 months 18 days	10 years
Gross carrying amount	$ 249,831,000	$ 29,831,000
Accumulated amortization	28,497,000	20,981,000
Net carrying amount	$ 221,334,000	$ 8,850,000
Technologies
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	12 years 3 months 18 days	12 years 1 month 6 days
Gross carrying amount	$ 82,370,000	$ 47,370,000
Accumulated amortization	42,860,000	39,266,000
Net carrying amount	$ 39,510,000	$ 8,104,000
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	16 years 3 months 18 days	20 years
Gross carrying amount	$ 28,894,000	$ 5,794,000
Accumulated amortization	5,044,000	2,739,000
Net carrying amount	$ 23,850,000	$ 3,055,000