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Credit Facility - Interest Rate Swaps (Details) - USD ($) | Jan. 31, 2018 | Nov. 13, 2017 | Nov. 01, 2017 | Oct. 31, 2017 | May 11, 2016
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Line of Credit Facility [Line Items] |  |  |  |  |
Net gains from cash flow hedges recorded in accumulated other comprehensive loss, net of tax | $ 15,700,000 |  |  | $ 1,700,000 |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | 5,000,000 |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Tax related to amounts in accumulated other comprehensive loss | $ 5,800,000 |  |  | $ 1,200,000 |
Interest Rate Swap |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notional amount |  | $ 285,000,000.0 | $ 215,000,000.0 |  | $ 105,000,000.0
Derivative, fixed interest rate (percent) |  | 1.69% | 1.65% |  | 1.05%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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