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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended	6 Months Ended
		Jul. 23, 2018 USD ($) employee	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Adjustment | $	[1]		$ 6,426	$ 6,426
Share-based Compensation Adjustment, Net of Tax | $				$ 4,726
Share-based Compensation Adjustment, Earnings per Share Adjustment | $ / shares				$ 0.17
Number of employees affected by modified service requirements | employee		320
Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				647
Weighted-average grant date fair value | $ / shares				$ 72.04
Stock option and SOSAR exercises (shares)				298
Units forfeited				95
Units expired				1
Granted, Weighted-Average Exercise Price | $ / shares				$ 388.86
Stock Options And SOSARs [Member] | Vesting Period 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				2 years
Stock Options And SOSARs [Member] | Vesting Period 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Stock Options And SOSARs [Member] | 3 Equal Installment Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				168
Vesting period				3 years
Stock Options And SOSARs [Member] | 18 Month Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				175
Vesting period				18 months
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				110
Weighted-average grant date fair value | $ / shares				$ 325.58
Units forfeited				11
Units released				3
Restricted Stock Units [Member] | Vesting Period 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				2 years
Restricted Stock Units [Member] | Vesting Period 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vested				29
Units forfeited				24
Performance Shares [Member] | 2018 Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted				29
Weighted-average grant date fair value | $ / shares				$ 327.58
Minimum [Member] | Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price premium				110.00%
Minimum [Member] | Performance Shares [Member] | 2018 Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				0.00%
Maximum [Member] | Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price premium				160.00%
Maximum [Member] | Performance Shares [Member] | 2018 Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				300.00%
Subsequent Event [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified service requirements expense | $		$ 9,000
Subsequent Event [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified service requirements expense | $		$ 10,000
[1] Cumulative adjustment to reduce stock-based compensation expense as we reduced our estimate of the number of certain awards that we expect will vest. See Note 9. "Stock-based Compensation" below for discussion of stock-based compensation expense related to the restructuring.

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