Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended									12 Months Ended		12 Months Ended					12 Months Ended	3 Months Ended			3 Months Ended		3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011	Jun. 11, 2010 Credit Agreement [Member]	Feb. 28, 2013 Credit Agreement [Member]	Dec. 19, 2012 Credit Agreement [Member]	Feb. 29, 2012 Credit Agreement [Member]	Jan. 18, 2012 Credit Agreement [Member]	Jan. 18, 2012 Credit Agreement [Member] Minimum [Member]	Jun. 11, 2010 Credit Agreement [Member] Minimum [Member]	Jan. 18, 2012 Credit Agreement [Member] Maximum [Member]	Jun. 11, 2010 Credit Agreement [Member] Maximum [Member]	Feb. 28, 2013 Accounts Receivable Facility [Member]	Sep. 21, 2012 Accounts Receivable Facility [Member]	Feb. 28, 2013 Accounts Receivable Facility [Member] Minimum [Member]	Feb. 28, 2013 Accounts Receivable Facility [Member] Maximum [Member]	Feb. 28, 2013 Non Publicly Traded [Member]	Feb. 28, 2013 Publicly Traded [Member]	Feb. 29, 2012 Publicly Traded [Member]	Feb. 28, 2013 Credit Agreements [Member]	Feb. 29, 2012 7.375% senior notes, due 2016 [Member]	Feb. 24, 2009 7.375% senior notes, due 2016 [Member]	May 24, 2006 7.375% senior notes, due 2016 [Member]	Feb. 29, 2012 7.375% notes, due 2016 [Member]	Feb. 24, 2009 7.375% notes, due 2016 [Member]	Feb. 29, 2012 7.375% senior notes and notes, due 2016 [Member]	Feb. 28, 2013 7.375% senior notes, due 2021 [Member]	Feb. 29, 2012 7.375% senior notes, due 2021 [Member]	Nov. 30, 2011 7.375% senior notes, due 2021 [Member]	Feb. 28, 2013 Letters of Credit [Member]
Debt Disclosure [Line Items]
Interest on line of credit facility borrowings																				1.50%
Current borrowing capacity				$ 350,000	$ 400,000			$ 400,000																						$ 130,800
Balances outstanding under the revolving credit facility													27,505																	27,505
Interest paid in cash on long-term debt	19,184	34,946	21,637
Aggregate principal amount of senior notes																						22,000	200,000		32,686				225,000
Repayment of long term debt under tender																					180,358			24,514
Cost charged on payments of notes																										9,101
Remaining unamortized discount and deferred financing costs related to notes written off																										21,711
Loss on extinguishment of debt		(30,812)																								30,812
Redeemed notes pursuant to tender offers																										49,814
Debt instrument principal amount outstanding percentage																					81.00%			75.00%
Interest rate of debt																											7.375%
Fair value of Corporations publicly and non-publicly traded debt																	61,200	233,577	239,562
Carrying value of Corporations publicly and non-publicly traded debt	286,381	225,181			61,200		0										61,200	225,181	225,181	61,200							225,000	225,000
Ability to increase credit agreement on revolving basis				50,000
Line of credit facility potential maximum borrowing capacity				400,000				450,000
Line of credit facility borrowings period				5 years
Line of credit facility basis spread on LIBOR rate									1.25%	2.25%	2.25%	3.50%
Line of credit facility basis spread on US and Canadian base rate									0.25%	1.25%	1.25%	2.50%
Commitment fee percentages on unused portion of facility									0.25%	0.375%	0.40%	0.50%
Percentage guaranteed on capital stock						65.00%
Available financing of receivables purchase agreement														50,000
Available financing of receivables purchase agreement														$ 70,000
Accounts Receivable Facility, term of agreement													3 years
Federal fund rate													0.50%
Annual commitment fee range															0.35%	0.45%