Basis points.

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Debt instrument frequency of principle payment.

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Debt.

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Maturity period of overdraft loan.

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Maturity period of term loan.

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Maturity period of unsecured bonds.

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Unsecured line of credit facility current borrowing capacity.

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount borrowed under the credit facility as of the balance sheet date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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Carrying value as of the balance sheet date of current portion of long-term loans payable to bank due within one year or the operating cycle if longer.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Debt (Details Textuals)	1 Months Ended	3 Months Ended														6 Months Ended
Debt (Details Textuals)	Mar. 31, 2010 JPY (¥)	Sep. 30, 2011 USD ($)	Mar. 31, 2010 JPY (¥)	Sep. 30, 2011 JPY (¥)	Aug. 18, 2011 USD ($)	Jun. 30, 2011 USD ($)	Sep. 30, 2009 JPY (¥)	Sep. 30, 2011 Senior notes matures on Aug 18, 2016 [Member] USD ($)	Sep. 30, 2011 Senior notes matures on Aug 18 ,2018 [Member] USD ($)	Sep. 30, 2011 Senior notes matures on Aug 18, 2021 [Member] USD ($)	Sep. 30, 2011 U.S Credit Facility [Member] USD ($)	Mar. 31, 2011 U.S Credit Facility [Member] USD ($)	Sep. 30, 2010 U.S Credit Facility [Member] USD ($)	Jun. 30, 2009 U.S Credit Facility [Member] USD ($)	Sep. 30, 2011 Overdraft loans [Member]	Sep. 30, 2011 Syndicated term loan [Member] JPY (¥)	Mar. 31, 2011 Syndicated term loan [Member] JPY (¥)	Sep. 30, 2010 Syndicated term loan [Member] JPY (¥)	Sep. 30, 2011 Unsecured bonds [Member] JPY (¥)	Mar. 31, 2011 Unsecured bonds [Member] JPY (¥)	Sep. 30, 2010 Unsecured bonds [Member] JPY (¥)	Mar. 31, 2010 Unsecured bonds [Member] JPY (¥)	Sep. 30, 2009 Unsecured bonds [Member]
Debt Instrument [Line Items]
Senior notes issued					$ 150,000,000			$ 50,000,000	$ 50,000,000	$ 50,000,000
Interest rate, stated percentage								2.91%	3.59%	4.28%	1.74%				2.48%								1.65%
Revolving credit facility												350,000,000	270,000,000	195,000,000
Applicable percentage based on consolidated leverage											1.50%
Maximum amount outstanding in line of credit facility		330,000,000									20,000,000
Scheduled principal payment																500,000,000	500,000,000	500,000,000	1,600,000,000	1,600,000,000	1,600,000,000	1,600,000,000
Applicable percentage based on consolidated leverage	0.75%		0.75%
Debt (Textuals) [Abstract]
Senior notes, outstanding		150,000,000
Overdraft loans		65,265,000		5,000,000,000		62,060,000
Maturity period of overdraft loan		6 months
Syndicated term loan to bank	3,000,000,000	19,500,000	3,000,000,000
Maturity period of term loan			3 years
Term loan interest rate description	interest rates equivalent to 6 month Tokyo Interbank Offered Rate (TIBOR) plus 75 basis points
Syndicated term loan to bank, current		13,100,000
Unsecured bonds							10,000,000,000
Maturity period of unsecured bonds		3 years
Unsecured bond outstanding		47,000,000
Unsecured bond current		47,000,000
Available lines of credit expiring between 2011 and 2021		406,400,000
Available lines of credit expiring between 2011 and 2021, unsecured portion		$ 350,000,000
Syndicated term loan frequency of principle payment	6 months