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Subsequent Event - Additional Information (Detail) - 2017 Credit Agreement [Member] - USD ($) |  | 9 Months Ended
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Oct. 31, 2017 | Sep. 30, 2017
Subsequent Event [Line Items] |  |
Credit agreement date |  | Oct. 31, 2017
Tranche A term loan facility [Member] | Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Amounts available to borrow under Credit Agreement | $ 750,000,000 |
Initial borrowing | 200,000,000 |
Remaining amount in credit facility | $ 550,000,000 |
Tranche A term loan facility [Member] | Subsequent Event [Member] | Minimum [Member] |  |
Subsequent Event [Line Items] |  |
Credit Agreement applicable fixed rate spread | 0.875% |
Credit Agreement applicable daily rate spread | 0.00% |
Tranche A term loan facility [Member] | Subsequent Event [Member] | Maximum [Member] |  |
Subsequent Event [Line Items] |  |
Credit Agreement applicable fixed rate spread | 1.25% |
Credit Agreement applicable daily rate spread | 0.25% |
Leverage ratio | 250.00% |
Revolving credit facility [Member] | Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Amounts available to borrow under Credit Agreement | $ 2,800,000,000 |
Remaining amount in credit facility | 83,000,000 |
Revolving credit facility [Member] | Subsequent Event [Member] | Canadian, Australian and New Zealand subsidiaries [Member] |  |
Subsequent Event [Line Items] |  |
Amounts available to borrow under Credit Agreement | 200,000,000 |
Revolving credit facility [Member] | Subsequent Event [Member] | U.K. subsidiaries [Member] |  |
Subsequent Event [Line Items] |  |
Amounts available to borrow under Credit Agreement | $ 300,000,000 |
Revolving credit facility [Member] | Subsequent Event [Member] | Minimum [Member] |  |
Subsequent Event [Line Items] |  |
Credit Agreement applicable fixed rate spread | 0.775% |
Credit Agreement applicable daily rate spread | 0.00% |
Revolving credit facility [Member] | Subsequent Event [Member] | Maximum [Member] |  |
Subsequent Event [Line Items] |  |
Credit Agreement applicable fixed rate spread | 1.075% |
Credit Agreement applicable daily rate spread | 0.075% |

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- Definition Credit agreement date. + References No definition available. + Details
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- Definition Leverage ratio. + References No definition available. + Details
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- Definition Long term debt percentage spread over daily interest rate + References No definition available. + Details
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- Definition Long term debt percentage spread over fixed interest rate + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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://www.xbrl.org/2003/role/presentationRef -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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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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