Accounts Receivable - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Jul. 31, 2017 |
Jul. 31, 2016 |
|
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Amount of accounts receivable factored | $ 41.1 | $ 0.9 |
London Interbank Offered Rate (LIBOR) | ||
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Interest rate on the sale of receivables | 0.85% |