Fair Value of Financial Instruments
9 Months Ended
Jan. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
The Company's financial instruments measured at fair value on a recurring basis as of January 31, 2016 and May 3, 2015 were as follows:
 
January 31, 2016
 
May 3, 2015
 
Carrying
 
Fair Value
 
Carrying
 
Fair Value
(in thousands)
Amount
 
Level 1
Level 2
Level 3
Total
 
Amount
 
Level 1
Level 2
Level 3
Total
Money market funds
$
—

 
$
—

$
—

$
—

$
—

 
$
196

 
$
196

$
—

$
—

$
196

Certificates of deposit
262,726

 
—

262,726

—

262,726

 
292,748

 
—

292,748

—

292,748

Total
$
262,726

 
$
—

$
262,726

$
—

$
262,726

 
$
292,944

 
$
196

$
292,748

$
—

$
292,944



The Company's Level 2 financial instruments in the table above are valued using quoted market prices for similar instruments or non-binding market prices that are corroborated by observable market data.

The Company has not estimated the fair value of its minority investments in three privately held companies as it is not practicable to estimate the fair value of these investments because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. As of January 31, 2016, the carrying value of the Company's minority investments in these privately held companies was $3.7 million, which management believes is not impaired.

The Company's financial instruments not measured at fair value on a recurring basis as of January 31, 2016 and May 3, 2015 were as follows:
 
January 31, 2016
 
May 3, 2015
 
Carrying
 
Fair Value
 
Carrying
 
Fair Value
(in thousands)
Amount
 
Level 1
Level 2
Level 3
Total
 
Amount
 
Level 1
Level 2
Level 3
Total
2033 Notes
228,561

 
237,403

—

—

237,403

 
221,406

 
264,364

—

—

264,364



The fair value of the 2033 Notes is based on the market price in the open market as of or close to the respective dates. The difference between the carrying value and the fair value is primarily due to the spread between the conversion price and the market value of the shares underlying the conversion as of each respective balance sheet date.