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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2014
September 2010 Senior Unsecured Notes
Mar. 31, 2013
September 2010 Senior Unsecured Notes
Jun. 30, 2012
May 2011 Authorized Amount
May 31, 2011
May 2011 Authorized Amount
May 21, 2014
May 2014 Authorized Amount
Subsequent Event
May 31, 2013
May 2013 Authorized Amount
Mar. 31, 2014
May 2013 Authorized Amount
Jun. 30, 2013
May 2012 Authorized Amount
May 31, 2012
May 2012 Authorized Amount
Stockholders Equity Note [Line Items]                  
Amount authorized to repurchase shares       $ 200.0 $ 200.0 $ 200.0     $ 200.0
Remaining amount of authorized for repurchase             200.0    
Stock repurchase program utilized amount     100.0         20.0  
Accumulated other comprehensive loss related to hedges, after-tax loss relating to interest rate hedges 2.4 2.9              
Accumulated other comprehensive loss related to hedges, pre-tax loss relating to interest rate hedges $ 3.7 $ 4.4