Long-Term Debt (2012 Term Loan and 2012 ABL Revolver) (Details) - USD ($)						3 Months Ended			6 Months Ended		38 Months Ended
	Feb. 04, 2016	Jun. 09, 2015	Sep. 03, 2014	Feb. 21, 2013	Jan. 31, 2012	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Mar. 31, 2016	May 08, 2015
Debt Instrument [Line Items]
Loss on extinguishment of debt						$ 0	$ 0		$ 0	$ 451,000
Term Loan and ABL Revolver 2012
Debt Instrument [Line Items]
Debt issuance costs capitalized					$ 20,600,000
2012 ABL Revolver | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity term					5 years
Line of credit facility, maximum borrowing capacity					$ 50,000,000.0	135,000,000.0			135,000,000.0
Line of credit facility, increase in borrowing capacity						$ 85,000,000.0			$ 85,000,000.0
Debt instrument, interest rate, increase/(decrease) (percent)											(0.25%)
Line of credit facility, commitment fee percentage					0.50%
Line of credit facility, conditional commitment fee percentage									0.375%
Line of credit facility, increase in accordion feature		$ 35,000,000.0
Long-term debt, weighted average interest rate						2.40%			2.40%
2012 ABL Revolver | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, fixed component (percent)			1.00%
2012 ABL Revolver | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Debt instrument, conditional variable rate (percent)			2.00%
2012 ABL Revolver | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Debt instrument, conditional variable rate (percent)			2.25%
2012 ABL Revolver | Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument, conditional variable rate (percent)			1.00%
2012 ABL Revolver | Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, conditional variable rate (percent)			1.25%
2012 ABL Revolver | Revolving Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, fixed component (percent)			0.50%
2012 ABL Revolver Amendment 3 | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, increase in borrowing capacity			$ 40,000,000.0
2012 ABL Revolver Amendment 5 | Revolving Credit Facility
Debt Instrument [Line Items]
Temporary suspension of financial reporting covenant, period	60 days
Senior Notes | 2012 Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount					$ 660,000,000.0
Debt instrument, stated interest rate (percent)				8.125%
Term Loans | 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, maturity term					7 years
Debt instrument, discount, percentage					1.50%
Proceeds from issuance of long-term debt					$ 650,100,000
Term Loans | Amendment 1, 2012 Term Loan
Debt Instrument [Line Items]
Loss on extinguishment of debt								$ 1,400,000
Term Loans | Amendment 1, 2012 Term Loan | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (percent)				2.75%
Debt instrument, reference rate floor (percent)				1.00%
Term Loans | Amendment 1, 2012 Term Loan | Base Rate
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)				2.00%
Term Loans | Amendment 2, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)			1.00%
Term Loans | Amendment 2, 2012 Term Loan | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (percent)			3.125%
Term Loans | Amendment 2, 2012 Term Loan | Base Rate
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)			2.00%
Term Loans | Amendment 3, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, average interest rate during period (percent)						5.00%
Term Loans | Amendment 3, 2012 Term Loan | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, fixed component (percent)			1.00%
Term Loans | Amendment 3, 2012 Term Loan | LIBOR | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (percent)			0.75%
Term Loans | Amendment 3, 2012 Term Loan | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, fixed component (percent)			1.75%
Term Loans | Amendment 3, 2012 Term Loan | Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, fixed component (percent)			0.50%
Term B-2 | Amendment 2, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount			$ 720,000,000.0
Term B-2 | Amendment 2, 2012 Term Loan | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (percent)			3.50%
Debt instrument, reference rate floor (percent)			1.00%
Term B-2 | Amendment 2, 2012 Term Loan | Base Rate
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)			2.00%
Debt instrument, step down interest rate (percent)			3.25%
Term B-2 | Amendment 3, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													$ 645,000,000.0
Loans Payable, Term B-3 | 2012 Senior Notes | LIBOR
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)						0.75%			0.75%			0.75%
Loans Payable, Term B-3 | 2012 Senior Notes | Base Rate
Debt Instrument [Line Items]
Debt instrument, reference rate floor (percent)						1.75%			1.75%			1.75%
Loans Payable, Term B-3 | Amendment 3, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													852,500,000.0
Loans Payable, Term B-1 | Amendment 3, 2012 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													$ 207,500,000.0