Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance, net of tax		$ (209.4)	$ (128.9)	$ (162.0)	$ (45.8)
Other comprehensive (loss) income before reclassifications and tax		41.7	(3.1)	(26.9)	(85.8)
Tax benefit (expense)		(3.0)	(0.2)	11.2	(3.4)
Other comprehensive (loss) income before reclassifications, net of tax		38.7	(3.3)	(15.7)	(89.2)
Ending Balance, net of tax		(170.2)		(170.2)
Reclassification Out Of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Tax benefit (expense)		(0.5)	0.6	(3.8)	(1.3)
Reclassifications, before tax		1.0	1.9	11.3	6.6
Reclassifications, net of tax		0.5	2.5	7.5	5.3
Other comprehensive (loss) income, net of tax		39.2	(0.8)	(8.2)	(83.9)
Ending Balance, net of tax		(170.2)	(129.7)	(170.2)	(129.7)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance, net of tax	[1]	(100.2)	(48.2)	(70.8)	48.3
Other comprehensive (loss) income before reclassifications and tax	[1]	31.2	(6.1)	1.8	(102.6)
Tax benefit (expense)	[1]	0.0	0.0	0.0	0.0
Other comprehensive (loss) income before reclassifications, net of tax	[1]	31.2	(6.1)	1.8	(102.6)
Foreign currency translation adjustment | Reclassification Out Of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Tax benefit (expense)	[1]	0.0	0.0	0.0	0.0
Reclassifications, before tax	[1]	0.0	0.0	0.0	0.0
Reclassifications, net of tax	[1]	0.0	0.0	0.0	0.0
Other comprehensive (loss) income, net of tax	[1]	31.2	(6.1)	1.8	(102.6)
Ending Balance, net of tax	[1]	(69.0)	(54.3)	(69.0)	(54.3)
Pension benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance, net of tax		(107.9)	(81.8)	(90.6)	(94.0)
Other comprehensive (loss) income before reclassifications and tax		10.5	7.0	(28.3)	18.8
Tax benefit (expense)		(3.0)	(1.6)	11.1	(4.1)
Other comprehensive (loss) income before reclassifications, net of tax		7.5	5.4	(17.2)	14.7
Pension benefits | Reclassification Out Of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Tax benefit (expense)		(0.6)	0.5	(4.0)	(1.4)
Reclassifications, before tax		1.3	2.0	12.1	6.8
Reclassifications, net of tax	[2]	0.7	2.5	8.1	5.4
Other comprehensive (loss) income, net of tax		8.2	7.9	(9.1)	20.1
Ending Balance, net of tax		(99.7)	(73.9)	(99.7)	(73.9)
Derivative financial instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance, net of tax		(1.3)	1.1	(0.6)	(0.1)
Other comprehensive (loss) income before reclassifications and tax		0.0	(4.0)	(0.4)	(2.0)
Tax benefit (expense)		0.0	1.4	0.1	0.7
Other comprehensive (loss) income before reclassifications, net of tax		0.0	(2.6)	(0.3)	(1.3)
Derivative financial instruments | Reclassification Out Of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Tax benefit (expense)		0.1	0.1	0.2	0.1
Reclassifications, before tax		(0.3)	(0.1)	(0.8)	(0.2)
Reclassifications, net of tax	[3]	(0.2)	0.0	(0.6)	(0.1)
Other comprehensive (loss) income, net of tax		(0.2)	(2.6)	(0.9)	(1.4)
Ending Balance, net of tax		$ (1.5)	$ (1.5)	$ (1.5)	$ (1.5)

[1] Taxes are not provided on cumulative translation adjustments as substantially all translation adjustments relate to earnings that are intended to be indefinitely reinvested outside the U.S.

[2] Primarily includes net amortization of prior service costs and actuarial losses included in net periodic benefit cost (see Note K) that were reclassified from accumulated other comprehensive loss to operating expenses or cost of sales.

[3] Relates to foreign currency cash flow hedges that were reclassified from accumulated other comprehensive loss to other income, net.