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Acquired Intangible Assets, net (Tables)
 9 Months Ended
Jan. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets, Net
Acquired intangible assets, net, as of January 31, 2016 and April 30, 2015 for continuing operations are as follows (in thousands):
 
January 31,
2016
 
April 30,
2015
 
Gross Fair
Value
 
Accumulated
Amortization
 
Net Book
Value
 
Gross Fair
Value
 
Accumulated
Amortization
 
Net Book
Value
Customer relationships
$
11,835

 
$
(3,849
)
 
$
7,986

 
$
11,835

 
$
(2,921
)
 
$
8,914

Developed technology
3,265

 
(1,171
)
 
2,094

 
3,265

 
(681
)
 
2,584

Total
$
15,100

 
$
(5,020
)
 
$
10,080

 
$
15,100

 
$
(3,602
)
 
$
11,498
Estimate of Future Amortization Expense for Definite-Lived Intangible Assets
The following table presents our estimate of future amortization expense for definite-lived intangible assets (in thousands):
Fiscal period:
Amount
Remaining three months of Fiscal year 2016
$
472

Fiscal year 2017
1,890

Fiscal year 2018
1,890

Fiscal year 2019
1,856

Fiscal year 2020
1,130

Thereafter
2,842

Total
$
10,080