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Debt and Financing Arrangements - Note Hedges and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Feb. 27, 2018 | Feb. 23, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | [1]
Debt Instrument [Line Items] |  |  |  |
Aggregate amount paid for cost of Note Hedge | $ 80,000 |  |  |
Number of warrants issued, subject to anti-dilution adjustments (in shares) |  | 7.1 |  |
Per share value, shares issuable under warrants granted (in dollars per share) |  | $ 68.06 |  |
Proceeds from issuance of warrants related to convertible notes |  | $ 52,400 | $ 52,440 | $ 0
Senior Notes | Convertible Senior Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Shares issuable under warrants granted (in shares) |  | 7.1 |  |
Conversion price (in dollars per share) |  | $ 48.36 |  |
[1] | See Note 2 for a summary of adjustments.

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- Definition The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3581-108585 + Details
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