Long-Term Debt (Details 2) (USD $)			12 Months Ended		1 Months Ended	12 Months Ended					1 Months Ended	12 Months Ended	1 Months Ended							12 Months Ended		12 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012 Eurodollar rate Minimum	Sep. 30, 2012 Eurodollar rate Maximum	Mar. 31, 2011 Credit Agreement Base rate	Sep. 30, 2012 Credit Agreement Base rate	Sep. 30, 2012 Credit Agreement Base rate U.S. federal funds base rate	Mar. 28, 2011 Credit Agreement Base rate U.S. federal funds base rate	Sep. 30, 2012 Credit Agreement Base rate Eurocurrency base rate	Mar. 28, 2011 Credit Agreement Base rate Eurocurrency base rate	Mar. 31, 2011 Credit Agreement Eurocurrency rate	Sep. 30, 2012 Credit Agreement Eurocurrency rate	Mar. 31, 2011 Credit facility	Sep. 30, 2012 Credit facility	Mar. 28, 2011 Credit facility	Sep. 30, 2012 Standby letters of credit	Mar. 28, 2011 Standby letters of credit	Sep. 30, 2012 Multicurrency borrowings and letter of credit	Mar. 28, 2011 Multicurrency borrowings and letter of credit	Sep. 30, 2012 Bank overdraft facility entity	Oct. 02, 2011 Bank overdraft facility	Oct. 02, 2011 Letter of credit agreements agreement	Oct. 02, 2011 Standby letters of credit under letter of credit agreements entity	Sep. 30, 2012 Standby letters of credit under letter of credit agreements
Long-Term Debt
Maximum borrowing capacity															$ 460,000,000		$ 200,000,000		$ 100,000,000				$ 30,000,000	$ 10,000,000
Term of revolving credit facility (in years)													P5Y
Borrowing which may be increased from time to time under revolving credit facility															140,000,000
Outstanding amount of borrowings and standby letters of credit														79,200,000		19,000,000		14,200,000
Weighted-average interest rate (as a percent)														2.15%
Availability under Facility														361,800,000
Basis spread on variable rate (as a percent)							0.50%	0.50%	1.00%	1.00%
Margin spread on variable rate basis, low end of range (as a percent)					0.50%	0.50%					1.50%	1.50%
Margin spread on variable rate basis, high end of range (as a percent)					1.50%	1.50%					2.50%	2.50%
Term of borrowings			30 days	90 days
Bank overdraft facility																				500,000	700,000
Number of foreign affiliates																				1
Number of agreements entered																						2
Number of banks with whom entity entered into agreement																							2
Outstanding balance																		5,300,000
Capital leases	2,800,000	1,700,000
Property and equipment loans	500,000	1,200,000
Scheduled maturities of long-term debt
2013	2,031,000
2014	848,000
2015	601,000
2016	79,598,000
Total long-term debt	$ 83,078,000	$ 147,424,000