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Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Allowance for doubtful accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 680 $ 722 $ 844
Charged to Costs and Expenses 1,319 5 [1] (122)
Charged to Other Accounts 108 [2]   127 [3]
Deductions (1,509) [4] (47) (127)
Ending Balance 598 680 722
Deferred tax valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 2,561 2,621 2,418
Charged to Costs and Expenses 231 (60) 203
Ending Balance $ 2,792 $ 2,561 $ 2,621
[1] Amount does not include $506,000 Charged to Costs and Expenses related to notes receivable.
[2] Increase in fiscal 2017 valuation accounts represents acquired balances related to the 2017 Acquisitions.
[3] Increase in fiscal 2015 valuation accounts represents acquired balances related to the DRP and BTI Acquisitions.
[4] Decrease in fiscal 2017 valuation accounts primarily represents a write-off of one of our customers’ accounts receivable balances.