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Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Allowance for doubtful accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of Period $ 598 $ 680 $ 722
Charged to Costs and Expenses 1,000 1,319 5 [1]
Charged to Other Accounts 401 [2] 108 [3]  
Deductions (175) (1,509) [4] (47)
End of Period 1,824 598 680
Deferred tax valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of Period 2,792 2,561 2,621
Charged to Costs and Expenses 544 231 (60)
End of Period $ 3,336 $ 2,792 $ 2,561
[1] Amount does not include $506,000 Charged to Costs and Expenses related to notes receivable.
[2] Increase in fiscal 2018 valuation accounts represents acquired balances related to the Gemtech acquisition.
[3] Increase in fiscal 2017 valuation accounts represents acquired balances related to the 2017 Acquisitions.
[4] Decrease in fiscal 2017 valuation accounts primarily represents a write-off of one of our customers’ accounts receivable balances.