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Debt (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 12, 2011
Apr. 30, 2011
Jul. 31, 2011
Jul. 31, 2010
Apr. 30, 2011
Revolver [Member]
Jul. 31, 2011
Revolver [Member]
Feb. 15, 2011
7.125% Senior Notes Due In 2015 [Member]
Jan. 31, 2007
7.125% Senior Notes Due In 2015 [Member]
Apr. 30, 2011
7.125% Senior Notes Due In 2015 [Member]
Jul. 31, 2011
7.125% Senior Notes Due In 2015 [Member]
Jul. 31, 2011
Maximum [Member]
Jul. 31, 2011
Minimum [Member]
Aggregate principal amount of a new credit agreement $ 750,000,000                      
Line of credit facility maturity date January 12, 2016                      
Line of credit facility, initiation date January 12, 2011                      
Aggregate principal amount term loan facility 250,000,000                      
Additional borrowing capacity 250,000,000                      
Credit agreement interest rate description    

Amounts outstanding under the new Credit Agreement bear interest, at the Company's option, at either the base rate, which is a rate per annum equal to the greatest of (a) KeyBank's prime rate, (b) one-half of one percent in excess of the federal funds effective rate and (c) one percent in excess of the adjusted LIBOR rate for a one-month interest period on such day, or the LIBOR or adjusted foreign currency rate, plus, in each case, an applicable margin in respect of base rate loans and in respect of LIBOR or adjusted foreign currency rate loans. The applicable margins are determined quarterly based upon the Company's ratio of consolidated funded indebtedness to consolidated proforma EBITDA, as defined in the Credit Agreement.

                 
Revolving credit facility commitment fee                     0.50% 0.15%
Percentage of quarterly amortization of term loan facility for first three years     5.00%                  
Percentage of quarterly amortization of term loan facility for fourth and fifth years     10.00%                  
Debt instrument, payment terms    
The term loan facility will amortize in equal quarterly installments as follows, with the remainder due on the term loan maturity date: 5% of the aggregate principal amount of the term loan for the first three years following the closing date and 10% of the aggregate principal amount of the term loan for the fourth and fifth years following the closing date

 

Pursuant to the terms of the Credit Agreement, the Company is also required to maintain specified financial ratios:

 

  •  

The ratio of Consolidated Proforma EBITDA to Consolidated Interest Expense (as defined, Interest Coverage Ratio) be at least 3.00 to 1.00 at all times.

 

  •  

The ratio of Consolidated Funded Indebtedness to Consolidated Proforma EBITDA (as defined, Total Leverage Ratio) be no higher than 3.75 to 1.00.

                 
Required minimum interest coverage ratio     3.00                  
Required maximum total leverage ratio     3.75                  
Debt instrument, covenant description    

Pursuant to the terms of the Credit Agreement, the Company is also required to maintain specified financial ratios:

 

  •  

The ratio of Consolidated Proforma EBITDA to Consolidated Interest Expense (as defined, Interest Coverage Ratio) be at least 3.00 to 1.00 at all times.

 

  •  

The ratio of Consolidated Funded Indebtedness to Consolidated Proforma EBITDA (as defined, Total Leverage Ratio) be no higher than 3.75 to 1.00.

                 
Debt instrument, covenant compliance     At July 31, 2011, the Company's Interest Coverage Ratio was 15.80 to 1.00 and the Total Leverage Ratio was 1.26 to 1.00.                  
Interest coverage ratio     15.80                  
Total leverage ratio     1.26                  
Existing debt issuance cost     500,000                  
Debt issuance costs incurred to refinance Credit Agreement     9,582,000 0                
Amount available under the credit agreement     574,800,000                  
Aggregate principal amount of senior notes               350,000,000   350,000,000    
Senior notes interest rate               7.125%        
Senior notes maturity date               February 15, 2015        
Senior notes, repayment terms     The Notes paid interest semi-annually on February 15 and August 15 of each year, beginning August 15, 2007                  
Aggregate principal outstanding amount redeemed             339,000,000          
Redemption price of notes             103.563%          
Loss on repurchase of notes   16,500,000 16,500,000                  
Write-off of unamortized cost         300,000 300,000     4,400,000 4,400,000    
Redemption premium related to notes   $ 12,100,000 $ 12,100,000