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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Amortizable    
Gross Carrying Amount 457,178 145,924
Accumulated Amortization 44,155 8,174
Non-amortizable    
Gross Carrying Amount of trade names 29,580 11,740
Gross carrying amount of intangible assets 486,758 157,664
Customer relationships
   
Amortizable    
Gross Carrying Amount 407,835 128,071
Accumulated Amortization 30,959 3,868
Customer relationships | Minimum
   
Intangible assets    
AMORTIZABLE Lives 5 years 5 years
Customer relationships | Maximum
   
Intangible assets    
AMORTIZABLE Lives 20 years 20 years
Customer relationships | Weighted average
   
Intangible assets    
AMORTIZABLE Lives 11 years  
Lease and other agreements
   
Amortizable    
Gross Carrying Amount 15,210 2,810
Accumulated Amortization 7,018 1,545
Lease and other agreements | Minimum
   
Intangible assets    
AMORTIZABLE Lives 1 year 1 year
Lease and other agreements | Maximum
   
Intangible assets    
AMORTIZABLE Lives 8 years 8 years
Non-compete agreements
   
Amortizable    
Gross Carrying Amount 11,855 5,033
Accumulated Amortization 2,871 919
Non-compete agreements | Minimum
   
Intangible assets    
AMORTIZABLE Lives 2 years 2 years
Non-compete agreements | Maximum
   
Intangible assets    
AMORTIZABLE Lives 7 years 7 years
Trade names
   
Amortizable    
Gross Carrying Amount 2,784 2,700
Accumulated Amortization 326  
Trade names | Minimum
   
Intangible assets    
AMORTIZABLE Lives 3 years 3 years
Trade names | Maximum
   
Intangible assets    
AMORTIZABLE Lives 10 years 10 years
Debt issuance costs
   
Amortizable    
Gross Carrying Amount 19,494 7,310
Accumulated Amortization 2,981 1,842
Debt issuance costs | Minimum
   
Intangible assets    
AMORTIZABLE Lives 5 years 5 years
Debt issuance costs | Maximum
   
Intangible assets    
AMORTIZABLE Lives 10 years 10 years