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Long-term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Oct. 31, 2011 | Jun. 30, 2018 | Apr. 30, 2018 | Jul. 31, 2015 | Feb. 28, 2015 | Jul. 31, 2018 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2012 | Oct. 31, 2017 | Mar. 31, 2017 | Apr. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan facility |  |  |  |  |  |  | $ 1,555,122,000 |  |  |  |  |  |
Group of Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant compliance description |  |  |  |  |  |  | We were in compliance with all covenants at July 31, 2018. |  |  |  |  |  |
Weighted average interest rate for borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 3.19%
Term loan |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Repayment of term loan |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant compliance description |  |  |  |  |  |  | We were in compliance with all covenants at July 31, 2018 |  |  |  |  |  |
Term loan facility |  |  |  |  |  |  |  |  |  |  |  | $ 705,000,000 |
Term loan facility due in September 2018 |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |
Term loan facility due in March 2020 |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |
Term loan facility due in March 2022 |  |  |  |  |  |  |  |  |  |  |  | $ 305,000,000 |
Weighted average interest rate for borrowings |  |  |  |  |  |  | 3.16% |  |  |  |  |  |
Term Loan Due April 2020 [Member] | Group of Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |  |  | $ 200,000,000 |  |  |
Debt instrument, covenant compliance description |  |  |  |  |  |  | We were in compliance with all covenants at July 31, 2018. |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  | $ 156,700,000 |  |  |  | $ 172,600,000 |  |
Senior Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period | 2023-06 |  |  |  |  |  |  |  |  | 2018-07 |  |  |
Debt instrument, fixed interest rates | 3.71% |  | 3.71% |  |  |  |  |  |  | 2.62% |  |  |
Senior Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period | 2030-06 |  |  |  |  |  |  |  |  | 2025-07 |  |  |
Debt instrument, fixed interest rates | 4.17% |  | 4.17% |  |  |  |  |  |  | 3.13% |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  |  | 2020-02 |  |  |  |  |  |  |
Debt instrument, covenant compliance description |  |  |  |  |  |  | We were in compliance with all covenants at July 31, 2018, and the amount we could borrow under the facility would not have been limited by any debt covenants. |  |  |  |  |  |
Repayments of outstanding balance under syndicated revolving credit facility |  |  | $ 315,000,000 |  |  |  |  |  |  |  |  |  |
Revolving credit facility | $ 850,000,000 |  | $ 850,000,000 |  |  | $ 600,000,000 |  |  |  |  |  |  |
Credit facility, term |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  | $ 0 |  |  |  | 249,138,000 |  |
Revolving Credit Agreement [Member] | Swing Line Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Syndicated Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  |  | 2016-12 |  |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Debt instrument, covenant compliance description |  |  |  |  |  |  | We were in compliance with all covenants at July 31, 2018, and the amount we could borrow would not have been limited by any debt covenants. |  |  |  |  |  |
period of agreements |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Maximum credit facility |  |  |  |  |  |  |  | $ 200,000,000 | $ 180,000,000 |  |  |  |
Maximum life of borrowings |  |  |  |  |  |  | 12 years |  |  |  |  |  |
Maximum average life of borrowings |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  | $ 146,666,000 |  |  |  | $ 146,666,000 |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  | 2018-09 |  |  |  |  |  |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member] | Note A and B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, fixed interest rates |  |  |  |  |  |  | 2.21% |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member] | Note D 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, floating interest rates |  |  |  |  |  |  | 3.47% |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  | 2026-09 |  |  |  |  |  |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member] | Note C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, fixed interest rates |  |  |  |  |  |  | 2.56% |  |  |  |  |  |
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member] | Note D 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, floating interest rates |  |  |  |  |  |  | 3.59% |  |  |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan facility |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  | 2019-07 |  |  |  |  |  |  |  |
Debt instrument, fixed interest rates |  |  |  |  | 2.89% |  |  |  |  |  |  |  |
Senior Unsecured Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  | 2027-07 |  |  |  |  |  |  |  |
Debt instrument, fixed interest rates |  |  |  |  | 3.19% |  |  |  |  |  |  |  |

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- Definition Long term debt current borrowing capacity. + References No definition available. + Details
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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: 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 + Details
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- Definition Period of time between issuance and maturity of debt instrument, 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 current and noncurrent portions 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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