PRINCIPAL ACCOUNTING POLICIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in receivables, due to the expansion of use of extended payment terms			$ 7.2
Accounts and notes receivable	334.6	327.4	334.6	366.2	327.4
Bad debt expense	4.9	1.4	8.8		3.8
Bad debt expense as percentage of revenues	3.10%	0.70%	1.20%		0.50%
Increase in bad debt reserves	4.3
Total bad debt reserve	6.7		6.7	5.5
Payment term over which a note receivable is considered non-performing	180 days
Costs of distribution	5.8	6.5
Notes receivable, net due over 90 days	0.70%		0.70%
Investments in various money market funds	1.0		1.0
Credit to retained earnings for deferred jackpot liability expense recorded in other current assets				0.8
International | Certain Jurisdictions | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	18 months
International | Certain Jurisdictions | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	36 months
International | Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and notes receivable	55.6		55.6	59.6
International | Argentina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and notes receivable	55.5		55.5	55.9
International | Peru
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and notes receivable	$ 22.5		$ 22.5	$ 24.5
International | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	120 days
International | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	36 months
Typical Cases | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, extended credit term	1 year
Non-Typical Cases | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, extended credit term	3 years
Annually investigated | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, extended credit term	1 year
Qualify for revenue recognition at time of sale | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, extended credit term	36 months
Incur interest at rates in excess of borrowing rate | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	12 months
External Credit Rating, Standard & Poor's | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers credit rating	D
External Credit Rating, Standard & Poor's | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers credit rating	BBB+
Product sale receivable classified as note receivable regardless | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	12 months
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	30 days
Product sales, extended credit term	120 days
Product sales, extended credit, interest receivable period	12 months
Uniform Commercial Code (UCC) term	90 days
Interest rates on outstanding notes receivable	5.25%		5.25%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product sales, credit term	120 days
Product sales, extended credit term	36 months
Interest rates on outstanding notes receivable	10.00%		10.00%