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Intangible Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Jul. 31, 2016
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount $ 361,095,000   $ 361,095,000   $ 361,095,000
Accumulated amortization 88,488,000   88,488,000   76,401,000
Net carrying amount 272,607,000   272,607,000   $ 284,694,000
Amortization of intangibles 6,032,000 $ 1,196,000 12,087,000 $ 2,572,000  
Amortization expense - year one 22,823,000   22,823,000    
Amortization expense - year two 21,075,000   21,075,000    
Amortization expense - year three 17,155,000   17,155,000    
Amortization expense - year four 17,155,000   17,155,000    
Amortization expense - year five 16,196,000   $ 16,196,000    
Customer Relationships          
Finite-Lived Intangible Assets [Line Items]          
Weighted average amortization period     20 years 3 months 18 days   20 years 3 months 18 days
Gross carrying amount 249,831,000   $ 249,831,000   $ 249,831,000
Accumulated amortization 35,210,000   35,210,000   28,497,000
Net carrying amount 214,621,000   $ 214,621,000   $ 221,334,000
Technologies          
Finite-Lived Intangible Assets [Line Items]          
Weighted average amortization period     12 years 3 months 18 days   12 years 3 months 18 days
Gross carrying amount 82,370,000   $ 82,370,000   $ 82,370,000
Accumulated amortization 45,741,000   45,741,000   42,860,000
Net carrying amount 36,629,000   $ 36,629,000   $ 39,510,000
Trademarks and other          
Finite-Lived Intangible Assets [Line Items]          
Weighted average amortization period     16 years 3 months 18 days   16 years 3 months 18 days
Gross carrying amount 28,894,000   $ 28,894,000   $ 28,894,000
Accumulated amortization 7,537,000   7,537,000   5,044,000
Net carrying amount $ 21,357,000   $ 21,357,000   $ 23,850,000