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Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair value of financial assets and liabilities measured and recorded at fair value on recurring basis
The following table summarizes the Company's financial assets and liabilities that are measured and recorded at fair value on a recurring basis, excluding accrued interest components:
 
 
September 30,
2017
 
April 1,
2017
 
 
(millions)
Derivative assets(a)
 
$
15.7

 
$
32.6

Derivative liabilities(a)
 
79.4

 
21.7

 
(a) 
Based on Level 2 measurements.
Carrying value and the estimated fair value of the Company's debt obligations
The following table summarizes the carrying values and the estimated fair values of the Company's debt instruments:
 
 
September 30, 2017
 
April 1, 2017
 
 
Carrying Value(a)
 
Fair Value(b)
 
Carrying Value(a)
 
Fair Value(b)
 
 
(millions)
$300 million 2.125% Senior Notes
 
$
298.6

 
$
301.6

 
$
298.1

 
$
302.2

$300 million 2.625% Senior Notes
 
291.8

 
304.6

 
290.1

 
302.8

 
 
(a) 
See Note 10 for discussion of the carrying values of the Company's Senior Notes.
(b) 
Based on Level 2 measurements.