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Summary of business operations and significant accounting policies (Tables)
 12 Months Ended
Jul. 31, 2017
Accounting Policies [Abstract]  
Property, Plant, and Equipment

Property, plant, and equipment consisted of the following:  

 

 

 

Estimated Useful Lives

 

July 31,

 

(in millions)

 

(Years)

 

2017

 

 

2016

 

Property, plant, and equipment:

 

 

 

 

 

 

 

 

 

 

Land and improvements

 

15 years for land improvements

 

 

7.1

 

 

 

7.0

 

Building and improvements

 

10 to 35

 

 

86.4

 

 

 

85.0

 

Leasehold improvements

 

lesser of useful life or the lease term

 

 

9.8

 

 

 

10.1

 

Equipment and software

 

3 to 7

 

 

147.2

 

 

 

142.7

 

Furniture and fixtures

 

5

 

 

7.2

 

 

 

7.6

 

Demonstration Inventory

 

3

 

 

9.9

 

 

 

3.9

 

 

 

 

 

$

267.6

 

 

$

256.3

 

Less accumulated depreciation and

   amortization

 

 

 

 

(164.9

)

 

 

(148.5

)

Total property, plant and equipment

 

 

 

$

102.7

 

 

$

107.8