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Restructuring Charges (Tables)
 12 Months Ended
Apr. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
As of April 30, 2017, 2016 and 2015, the accrued liability associated with the Company's restructuring activities consisted of the following (in thousands):
 
Workforce Reduction
 
Excess Facilities
 
Total
 
(in thousands)
Balance at April 30, 2015
$
—

 
$
—

 
$
—

    Restructuring charges
1,029

 
546

 
1,575

    Payments
(532
)
 
—

 
(532
)
Balance at April 30, 2016
$
497

 
$
546

 
$
1,043

    Restructuring charges
1,567

 
635

 
2,202

    Payments
(956
)
 
(294
)
 
(1,250
)
    Non-cash settlements of restructuring charges
—

 
(588
)
 
(588
)
Balance at April 30, 2017
1,108

 
299

 
1,407