Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jan. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Quantifying Prior Year Misstatements Corrected in Current Year Financial Statements
The impact of these misstatements is included in the Fiscal 2015 amounts in the accompanying condensed consolidated financial statements, including applicable footnotes, and is summarized as follows (millions of dollars except per share amounts):
 
Three Months Ended
January 31, 2015
 
Six Months Ended
January 31, 2015
 
As Previously Reported
 
Effect of Revision
 
As Revised
 
As Previously Reported
 
Effect of Revision
 
As Revised
Net sales
$
596.9

 
$
(8.4
)
 
$
588.5

 
$
1,193.4

 
$
(8.4
)
 
$
1,185.0

Cost of sales
391.4

 
(6.0
)
 
385.4

 
778.8

 
(6.0
)
 
772.8

Gross profit
205.5

 
(2.4
)
 
203.1

 
414.6

 
(2.4
)
 
412.2

Operating income
68.2

 
(2.4
)
 
65.8

 
145.2

 
(2.4
)
 
142.8

Earnings before income taxes
67.8

 
(2.4
)
 
65.4

 
145.1

 
(2.4
)
 
142.7

Income taxes
18.2

 
(0.8
)
 
17.4

 
39.6

 
(0.8
)
 
38.8

Net earnings
$
49.6

 
$
(1.6
)
 
$
48.0

 
$
105.5

 
$
(1.6
)
 
$
103.9

Basic earnings per share
0.36

 
(0.01
)
 
0.35

 
0.76

 
(0.01
)
 
0.75

Diluted earnings per share
0.35

 
(0.01
)
 
0.34

 
0.75

 
(0.01
)
 
0.74

Comprehensive income
3.4

 
(1.6
)
 
1.8

 
22.4

 
(1.6
)
 
20.8