Net Carrying Value of Term Loan (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jul. 31, 2018
Debt Instrument [Line Items]
Principal amount outstanding on the Term Loan	$ 63,925	$ 67,625
Term Loan \| Cerberus Credit Facility
Debt Instrument [Line Items]
Principal amount outstanding on the Term Loan	388,500	390,000
Unamortized debt issuance costs	(1,094)	(1,162)
Net carrying value of the Term Loan	$ 387,406	$ 388,838

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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