Compensation Plans: Stock Based (Details) (USD $)	1 Months Ended			12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Compensation plans
Excess Tax Benefit from Share-based Compensation, Financing Activities				$ 0		$ 854,000		$ 0
Employee Service Share-bassed Compensation, Cash Received from Exercise, All Grant Types				5,000,000		4,800,000		1,600,000
Performance Share Units, Restricted Stock Units, and Shares Issued to Directors [Abstract]
Stock-based compensation expense				26,824,000		26,743,000		18,765,000
Employee Stock Purchase Plan
Proceeds from Issuance of Common Stock				7,327,000		6,440,000		3,110,000
Additional disclosures
Stock-based Compensation, Number of Shares Available for Grant Under the Equity Incentive Compensation Program				2,700,000
Impact of Issuance of One Performance Share Award on Available Shares Under the Equity Incentive Plan				2.86
Impact Outright Issuance Of One Share Has On Number Of Available Shares				1.43
Performance Share Awards Under the Equity Incentive Compensation Plan [Member]
Compensation plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed				1
Performance Share Units, Restricted Stock Units, and Shares Issued to Directors [Abstract]
Stock-based compensation expense				19,700,000		17,700,000		9,300,000
Unrecognized stock based compensation expense				26,400,000
Fair value of PSUs/RSUs Vested in Period				13,000,000		6,600,000		1,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value				24,300,000		20,300,000		25,800,000
PSU/RSU Vesting Increment	0.571429	0.285714	0.142857
Shares held for settlement of income and payroll tax obligations (in shares)				98,955
Total PSUs Settled in Period				305,423
Stock issued for settlement, PSU, net of tax (in shares)				206,468
Common stock awards vesting multiplier, high end of range				2
Common stock awards vesting multiplier, low end of range				0
Activity
Non-vested at the beginning of the period (in shares)				1,110,666		1,069,090		464,333
Granted (in shares)				266,282		387,651		725,092
Vested (in shares)				(364,172)	[1]	(210,801)	[1]	(76,781)	[1]
Forfeited (in shares)				(126,882)		(135,274)		(43,554)
Non-vested at the end of the period (in shares)				885,894		1,110,666		1,069,090
Weighted Average Grant Date Fair Value
Non-vested outstanding at the beginning of the period (in dollars per share)				$ 39.48		$ 32.52		$ 26.48
Granted (in dollars per share)				$ 91.45		$ 52.35		$ 35.59
Vested (in dollars per share)				$ 35.74	[1]	$ 31.18	[1]	$ 27.20	[1]
Forfeited (in dollars per share)				$ 33.32		$ 34.28		$ 28.62
Non-vested outstanding at the end of the period (in dollars per share)				$ 57.52		$ 39.48		$ 32.52
Restricted Stock Units Under the Equity Incentive Compensation Plan [Member]
Performance Share Units, Restricted Stock Units, and Shares Issued to Directors [Abstract]
Stock-based compensation expense				5,300,000		7,700,000		7,900,000
Unrecognized stock based compensation expense				7,500,000
Fair value of PSUs/RSUs Vested in Period				3,200,000		7,400,000		9,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value				7,200,000		5,200,000		5,800,000
PSU/RSU Vesting Increment	0.571429	0.285714	0.142857
Total restricted stock units settled (in shares)				105,820		160,381		215,700
Stock issued for settlement, RSU, net of tax (in shares)				72,305		113,103		156,252
Shares held for settlement of income and payroll tax obligations (in shares)				33,515		47,278		59,448
Activity
Non-vested at the beginning of the period (in shares)				333,359		407,123		402,297
Granted (in shares)				98,952		128,865		241,745
Vested (in shares)				(105,820)		(160,398)		(211,092)
Forfeited (in shares)				(17,614)		(42,231)		(25,827)
Non-vested at the end of the period (in shares)				308,877		333,359		407,123
Weighted Average Grant Date Fair Value
Non-vested outstanding at the beginning of the period (in dollars per share)				$ 31.16		$ 34.67		$ 48.24
Granted (in dollars per share)				$ 72.69		$ 40.31		$ 23.87
Vested (in dollars per share)				$ 30.61		$ 46.30		$ 46.26
Forfeited (in dollars per share)				$ 36.80		$ 35.43		$ 50.35
Non-vested outstanding at the end of the period (in dollars per share)				$ 44.33		$ 31.16		$ 34.67
Stock Option Grants Under Prior Stock Option Plans [Member]
Stock Option Activity Rollforward
Stock options outstanding at the beginning of the period (in shares)				920,765		1,274,920		1,509,710
Stock Options: Exercised in Period (in shares)				(412,551)		(346,377)		(189,740)
Stock Options: Forfeitures in Period (in shares)				0		(7,778)		(45,050)
Stock options outstanding at the end of the period (in shares)				508,214		920,765		1,274,920
Stock Options: Weighted-average Exercise Price [Abstract]
Stock options outstanding at the beginning of the period (in dollars per share)				$ 13.11		$ 13.31		$ 12.69
Exercised (in dollars per share)				$ 12.19		$ 13.77		$ 8.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price				$ 0.00		$ 16.66		$ 13.38
Stock options outstanding at the end of the period (in dollars per share)				$ 13.86		$ 13.11		$ 13.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price				$ 13.86		$ 13.11		$ 13.31
Stock Options: Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value				24,359,240		11,281,865		4,625,148
Aggregate Intrinsic Value				30,109,110		42,192,057		26,684,106
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value				30,109,110		42,192,057		26,684,106
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number				508,214		920,765		1,274,920
Shares Issued to the Board of Directors [Member]
Performance Share Units, Restricted Stock Units, and Shares Issued to Directors [Abstract]
Stock-based compensation expense				1,200,000		781,000		688,000
Stock issued from treasury to non-employee directors (in shares)				21,568		24,258		50,094
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate				15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription				0
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date				85.00%
Shares issued (in shares)				41,358		52,948		86,308
Proceeds from Issuance of Common Stock				2,300,000		1,700,000		1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				0.15%		0.20%		0.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.16%		0.30%		0.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				36.27%		46.30%		95.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				0.5		0.5		0.5
Share-based Compensation				$ 682,000		$ 550,000		$ 848,000
Additional disclosures
Stock-based Compensation, Number of Shares Available for Grant Under the Equity Incentive Compensation Program				1,374,000
Exercise Price Range 1 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 10.86
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 11.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				35,964
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				0.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 11.76
Exercise Price Range 2 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 12.03
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				29,043
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				0.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 12.03
Exercise Price Range 3 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 12.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				13,080
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				0.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 12.08
Exercise Price Range 4 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 12.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				80,261
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 12.50
Exercise Price Range 5 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 12.53
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				43,001
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 12.53
Exercise Price Range 6 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 12.66
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				48,055
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 12.66
Exercise Price Range 7 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 13.39
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 13.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				21,051
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 13.39
Exercise Price Range 8 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 13.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 13.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				54,189
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 13.65
Exercise Price Range 9 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 14.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 14.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				134,710
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				2.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 14.25
Exercise Price Range 10 [Member]
Stock Options: Additional Disclosures [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 20.87
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 20.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				48,860
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				3.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 20.87

[1] 1)The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending on the ending three-year performance multiplier, which ranges from zero to