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Long - Term Debt - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Line of Credit Facility [Line Items] |  |  |
Line of credit, outstanding amount |  | $ 145,000,000 |
Interest expense | $ 5,187,000 | 9,730,000 | $ 1,592,000
Fees to secure the facility, amortized amount | $ 1,570,000 | 1,570,000 | 131,000
Asset-based revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, maturity period | 5 years |  |
Line of credit, commencement date | Jun. 30, 2016 |  |
Line of credit, maturity date | Jun. 30, 2021 |  |
Line of credit, current borrowing capacity | $ 500,000,000 |  |
Line of credit, entitled expansion option | 100,000,000 |  |
Line of credit, outstanding amount | $ 0 | $ 145,000,000 |
Line of credit, borrowing availability term | Borrowing availability under the credit agreement is limited to the lesser of the facility total and the monthly calculated borrowing base |  |
Line of credit, covenant term | The credit agreement has no financial covenant restrictions for borrowings as long as the Company has adjusted excess availability under the facility that exceeds 10% of the lesser of the line commitment or the borrowing base total, with a floor of $40,000. |  |
Line of credit, borrowing availability | $ 495,657,000 |  |
Weighted-average interest rate on borrowings | 2.82% | 2.34% |
Fees to secure the facility, amount incurred |  |  | 7,850,000
Fees to secure the facility, unamortized amount | $ 4,579,000 | $ 6,149,000 |
Asset-based revolving credit facility | Interest expense |  |  |
Line of Credit Facility [Line Items] |  |  |
Fees to secure the facility, amortized amount | $ 1,570,000 | 1,570,000 | $ 131,000
Asset-based revolving credit facility | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, percentage of line commitment to be exceeded by the excess borrowing availability | 10.00% |  |
Line of credit, borrowing base | $ 40,000,000 |  |
Asset-based revolving credit facility | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Fees to secure the facility, amortization period | 5 years |  |
Asset-based revolving credit facility | LIBOR rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, outstanding amount |  | $ 145,000,000 |
Line of credit, pricing spreads rate |  | 1.50% |
Line of credit, effective interest rate |  | 2.72% |
Asset-based revolving credit facility | LIBOR rate | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, pricing spreads rate | 1.25% |  |
Asset-based revolving credit facility | LIBOR rate | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, pricing spreads rate | 1.75% |  |
Asset-based revolving credit facility | Base rate | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, pricing spreads rate | 0.25% |  |
Asset-based revolving credit facility | Base rate | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, pricing spreads rate | 0.75% |  |
Asset-based revolving credit facility | LIBOR and base rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest expense | $ 1,939,000 | $ 7,002,000 |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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