Share-Based Compensation - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended		6 Months Ended	9 Months Ended											12 Months Ended	9 Months Ended						12 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended				1 Months Ended
	Dec. 08, 2010	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 D Y	Mar. 31, 2012 Y	Jun. 30, 2012	Mar. 31, 2013 Monte Carlo simulation [Member]	Mar. 31, 2012 Monte Carlo simulation [Member]	Mar. 31, 2013 Restricted stock [Member]	Mar. 31, 2013 Restricted stock units with earning per share performance conditions [Member]	Mar. 31, 2012 Restricted stock units with earning per share performance conditions [Member]	Mar. 31, 2013 Restricted stock units with return on invested capital performance conditions [Member]	Mar. 31, 2012 Restricted stock units with return on invested capital performance conditions [Member]	Mar. 31, 2013 Restricted stock units with market conditions [Member]	Mar. 31, 2012 Restricted stock units with market conditions [Member]	Mar. 31, 2013 2002 Plan [Member]	Mar. 31, 2012 2002 Plan [Member]	Mar. 31, 2011 2002 Plan [Member] Monte Carlo simulation [Member]	Mar. 31, 2013 2002 Plan [Member] Restricted Stock Units With Performance Conditions [Member]	Mar. 31, 2012 2002 Plan [Member] Restricted Stock Units With Performance Conditions [Member]	Jun. 30, 2010 2002 Plan [Member] Restricted Stock Units With Performance Conditions [Member] Y	Mar. 31, 2013 2002 Plan [Member] Restricted Stock Units [Member] Y	Mar. 31, 2012 2002 Plan [Member] Restricted Stock Units [Member] Y	Mar. 31, 2013 2002 Plan [Member] Common Stock [Member]	Mar. 31, 2011 2002 Plan [Member] Restricted stock units with earning per share performance conditions [Member] Y	Mar. 31, 2011 2002 Plan [Member] Restricted stock units with market conditions [Member] Y	Mar. 31, 2013 2012 Plan [Member]	Jun. 30, 2012 2012 Plan [Member]	Dec. 07, 2011 2012 Plan [Member]	Mar. 31, 2013 2012 Plan [Member] Full value grant [Member]	Mar. 31, 2013 2012 Plan [Member] Restricted Stock Units [Member]	Jun. 30, 2012 2012 Plan [Member] Restricted Stock Units [Member]	Mar. 31, 2013 2012 Plan [Member] Common Stock [Member]	Mar. 31, 2013 2012 Plan [Member] Stock-settled restricted stock units [Member]	Mar. 31, 2013 2012 Plan [Member] Cash-settled restricted stock units [Member]	Mar. 31, 2013 2012 Plan [Member] Stock appreciation rights [Member]	Sep. 30, 2008 Outside 2002 Plan [Member] Restricted Stock Units [Member]	Jan. 31, 2008 Outside 2002 Plan [Member] Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant																											3,191,713		4,400,000
Number of stock options, common stock and restricted stock units granted				522,775																		0		0									522,775	558,661	970
Stock option and incentive plan, maturity date																											Dec. 07, 2021
Number of awards for reduction of shares available for grant under 2012 Plan																											1
Reduction in shares available for grant for one award under the plan																														1.71
Stock appreciation rights																																				7,281
Number of shares available for grant of stock options, stock appreciation rights, restricted stock and restricted stock units	1,100,000
Grant of stock options stock appreciation rights, restricted stock and restricted stock units not to exceed for shares of common stock	7,860,000
Share-based compensation		$ 2,100,000	$ 5,500,000	$ 12,302,000	$ 13,437,000
Total income tax benefit recognized		100,000	1,300,000	2,700,000	3,500,000
Weighted-average grant-date fair value of options granted		$ 14.22	$ 19.71	$ 15.80	$ 14.30
Total intrinsic value of options exercised		1,100,000	5,000,000	7,300,000	5,800,000
Extended vesting period after employee termination, days				90
Total unrecognized compensation cost		26,500,000		26,500,000					0
Weighted average recognition period, years				1 year 4 months 24 days					0 years
Shares, outstanding									0
Restricted stock units granted										97,733	118,546	97,733	118,546	97,733	118,546				21,840	24,400	380,400	243,622	281,303		191,721	191,715					970	1,150					28,344	34,608
Cliff vesting period, in years				3	3
Compensation expenses recognized period (years)																3 years	3 years
Restricted stock units, grant date fair value							3,700,000	3,300,000										5,200,000
Cliff vesting period, in years																					3	3	3		3	3
Restricted stock units vested percentage																					39.80%
Number of restricted stock units settled				1,608	1,608																						0
Cash-settled restricted stock units, outstanding				0		1,608																					2,120	1,150
Restricted stock units settled cost				100,000	100,000
Aggregate intrinsic value of equity classified restricted stock		$ 78,300,000		$ 78,300,000