Supplemental Guarantor Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Feb. 28, 2018	Aug. 31, 2017	Feb. 28, 2017	Aug. 31, 2016
Current Assets:
Cash and cash equivalents	$ 229.8	$ 311.1	$ 463.2	$ 413.2
Accounts receivable, net	500.2	573.3
Inventories	322.1	328.6
Other current assets	41.3	32.6
Total current assets	1,093.4	1,245.6
Property, plant, and equipment, net	282.8	287.7
Goodwill	911.9	900.9
Intangible assets, net	447.5	448.8
Deferred income taxes	3.2	3.4
Other long-term assets	11.7	13.2
Investments in and amounts due from affiliates	0.0	0.0
Total assets	2,750.5	2,899.6
Current Liabilities:
Accounts payable	341.9	395.1
Current maturities of long-term debt	0.4	0.4
Other accrued liabilities	167.3	205.4
Total current liabilities	509.6	600.9
Long-term debt	356.5	356.5
Deferred income taxes	76.1	108.2
Other long-term liabilities	172.5	168.4
Amounts due to affiliates	0.0	0.0
Total stockholders’ equity	1,635.8	1,665.6
Total liabilities and stockholders’ equity	2,750.5	2,899.6
Parent
Current Assets:
Cash and cash equivalents	142.6	237.7	399.9	368.2
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	15.9	1.6
Total current assets	158.5	239.3
Property, plant, and equipment, net	0.2	0.2
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred income taxes	35.4	51.6
Other long-term assets	0.2	1.5
Investments in and amounts due from affiliates	1,553.9	1,500.3
Total assets	1,748.2	1,792.9
Current Liabilities:
Accounts payable	0.5	0.9
Current maturities of long-term debt	0.0	0.0
Other accrued liabilities	8.9	27.6
Total current liabilities	9.4	28.5
Long-term debt	0.0	0.0
Deferred income taxes	0.0	0.0
Other long-term liabilities	103.0	98.7
Amounts due to affiliates	0.0	0.0
Total stockholders’ equity	1,635.8	1,665.7
Total liabilities and stockholders’ equity	1,748.2	1,792.9
Subsidiary Issuer
Current Assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net	435.5	494.6
Inventories	295.6	305.5
Other current assets	13.6	15.8
Total current assets	744.7	815.9
Property, plant, and equipment, net	223.4	228.3
Goodwill	677.9	677.7
Intangible assets, net	229.4	235.5
Deferred income taxes	0.0	0.0
Other long-term assets	9.4	10.9
Investments in and amounts due from affiliates	468.9	330.4
Total assets	2,353.7	2,298.7
Current Liabilities:
Accounts payable	317.0	366.4
Current maturities of long-term debt	0.0	0.0
Other accrued liabilities	123.8	138.9
Total current liabilities	440.8	505.3
Long-term debt	353.3	353.1
Deferred income taxes	81.3	134.6
Other long-term liabilities	49.4	49.3
Amounts due to affiliates	0.0	0.0
Total stockholders’ equity	1,428.9	1,256.4
Total liabilities and stockholders’ equity	2,353.7	2,298.7
Subsidiary Guarantor
Current Assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	0.0	0.0
Total current assets	0.0	0.0
Property, plant, and equipment, net	0.0	0.0
Goodwill	2.7	2.7
Intangible assets, net	108.1	109.8
Deferred income taxes	0.0	0.0
Other long-term assets	0.0	0.0
Investments in and amounts due from affiliates	255.6	234.2
Total assets	366.4	346.7
Current Liabilities:
Accounts payable	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Other accrued liabilities	0.0	0.0
Total current liabilities	0.0	0.0
Long-term debt	0.0	0.0
Deferred income taxes	0.0	0.0
Other long-term liabilities	0.0	0.0
Amounts due to affiliates	0.0	0.0
Total stockholders’ equity	366.4	346.7
Total liabilities and stockholders’ equity	366.4	346.7
Non- Guarantors
Current Assets:
Cash and cash equivalents	87.2	73.4	63.3	45.0
Accounts receivable, net	64.7	78.7
Inventories	26.5	23.1
Other current assets	11.8	15.2
Total current assets	190.2	190.4
Property, plant, and equipment, net	59.2	59.2
Goodwill	231.3	220.5
Intangible assets, net	110.0	103.5
Deferred income taxes	(0.1)	8.0
Other long-term assets	2.1	0.8
Investments in and amounts due from affiliates	0.0	0.0
Total assets	592.7	582.4
Current Liabilities:
Accounts payable	24.4	27.8
Current maturities of long-term debt	0.4	0.4
Other accrued liabilities	34.6	38.9
Total current liabilities	59.4	67.1
Long-term debt	3.2	3.4
Deferred income taxes	26.9	29.8
Other long-term liabilities	20.1	20.4
Amounts due to affiliates	155.3	128.8
Total stockholders’ equity	327.8	332.9
Total liabilities and stockholders’ equity	592.7	582.4
Consolidating Adjustments
Current Assets:
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	0.0	0.0
Total current assets	0.0	0.0
Property, plant, and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred income taxes	(32.1)	(56.2)
Other long-term assets	0.0	0.0
Investments in and amounts due from affiliates	(2,278.4)	(2,064.9)
Total assets	(2,310.5)	(2,121.1)
Current Liabilities:
Accounts payable	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Other accrued liabilities	0.0	0.0
Total current liabilities	0.0	0.0
Long-term debt	0.0	0.0
Deferred income taxes	(32.1)	(56.2)
Other long-term liabilities	0.0	0.0
Amounts due to affiliates	(155.3)	(128.8)
Total stockholders’ equity	(2,123.1)	(1,936.1)
Total liabilities and stockholders’ equity	$ (2,310.5)	$ (2,121.1)