Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions |
1 Months Ended |
3 Months Ended |
|
May 31, 2017 |
Feb. 28, 2017 |
Nov. 30, 2016 |
Aug. 31, 2016 |
May 31, 2016 |
Mar. 31, 2016 |
Apr. 29, 2017 |
Apr. 30, 2016 |
Jan. 29, 2017 |
| Summary of Significant Accounting Policies [Line Items] |
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| Cash dividends declared per share (in dollars per share) |
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$ 0.1600
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$ 0.1350
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$ 0.1350
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$ 0.1350
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$ 0.1350
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$ 0.1600
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$ 0.1350
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| Operating leases, future minimum payments due |
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$ 3,500.0
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| Excess tax benefits related to stock-based compensation |
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13.2
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| Property, Plant and Equipment [Member] |
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| Summary of Significant Accounting Policies [Line Items] |
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| Property and equipment purchased but not yet paid |
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$ 6.3
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$ 5.6
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| Subsequent Event [Member] |
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| Summary of Significant Accounting Policies [Line Items] |
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| Cash dividends declared per share (in dollars per share) |
$ 0.1600
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| Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |
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| Summary of Significant Accounting Policies [Line Items] |
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| Cumulative-effect adjustment |
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$ 1.1
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