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Restructuring Charges (Tables)
 6 Months Ended
Oct. 31, 2017
Restructuring Charges [Abstract]  
Restructuring Charges
The Company's restructuring activities for the six months ended October 31, 2017 and 2016 are summarized as follows (in thousands):
 
Workforce Reduction
 
Excess Facilities
 
Total
 
 
Balance at April 30, 2016
$
497

 
$
546

 
$
1,043

    Restructuring charges
459

 
635

 
1,094

    Payments
(929
)
 
(837
)
 
(1,766
)
Balance at October 31, 2016
$
27

 
$
344

 
$
371

 
 
 
 
 
 
Balance at April 30, 2017
$
1,108

 
$
299

 
$
1,407

    Restructuring charges
56

 
—

 
56

    Payments
(1,164
)
 
(27
)
 
(1,191
)
    Non-cash settlements of restructuring charges
—

 
(46
)
 
(46
)
Balance at October 31, 2017
$
—

 
$
226

 
$
226