Debt (Additional Information) (Details) - USD ($)												1 Months Ended		3 Months Ended				12 Months Ended
	Jan. 26, 2024	Nov. 22, 2022	Sep. 22, 2022	Apr. 11, 2022	Mar. 11, 2022	Aug. 12, 2021	Jul. 29, 2021	Mar. 01, 2021	Mar. 31, 2020	Mar. 24, 2020	Apr. 13, 2018	Jun. 30, 2022	Mar. 31, 2022	Mar. 31, 2024	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 24, 2024	Apr. 26, 2024	Jan. 31, 2024
Line of Credit Facility [Line Items]
Repayment of long-term debt																		$ 51,896,000	$ 150,861,000	$ 1,079,713,000
Gain on extinguishment of debt																		0	71,000	2,072,000
Long-term debt, gross																		658,283,000	708,283,000
Line of Credit facility, initiation date											Apr. 13, 2018
Debt Issuance Costs Write-off																		1,113,000
Surety Bond [Member]
Line of Credit Facility [Line Items]
Guarantor Obligations, Current Carrying Value																		44,300,000
Interest Rate Swap
Line of Credit Facility [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax																				(4,525,000)
Interest Rate Swap | Interest Expense.
Line of Credit Facility [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax							$ (4,500,000)
Revolver
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 400,000,000.0
Letters Of Credit Outstanding, Increase (Decrease) Amount																		(90,800,000)
Letters of credit outstanding																		$ 227,300,000
Letters of credit expired																								$ 76,200,000
Commitment fee percentage																		0.25%
Undrawn amount on letters of credit																		$ 242,100,000
Long-term Line of Credit												$ 0				$ 0		$ 0	0	0
Term																		5 years
Revolver | Alternate Base Rate | Minimum
Line of Credit Facility [Line Items]
Basic spread rate																		2.75%
Revolver | Alternate Base Rate | Maximum
Line of Credit Facility [Line Items]
Basic spread rate																		3.25%
Revolver | SOFR
Line of Credit Facility [Line Items]
Basic spread rate																		0.75%
Revolver | SOFR | Minimum
Line of Credit Facility [Line Items]
Basic spread rate																		3.75%
Revolver | SOFR | Maximum
Line of Credit Facility [Line Items]
Basic spread rate																		4.25%
Walden Title IV Letter Of Credit | Surety Bond [Member]
Line of Credit Facility [Line Items]
Letters of credit outstanding																						$ 69,400,000	$ 84,000,000.0
Title IV Letter Of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding																		$ 157,900,000
Prior Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity											$ 300,000,000.0
Debt Issuance Costs Write-off																				6,000,000
Prior Revolving Credit Facility | Interest Expense.
Line of Credit Facility [Line Items]
Debt Issuance Costs Write-off																				6,000,000.0
Prior Revolving Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Application rate, percentage																					0.75%
Prior Revolving Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Application rate, percentage																					1.75%
Prior Revolving Credit Facility | Eurocurrency Rate | Minimum
Line of Credit Facility [Line Items]
Application rate, percentage																					1.75%
Prior Revolving Credit Facility | Eurocurrency Rate | Maximum
Line of Credit Facility [Line Items]
Application rate, percentage																					2.75%
Term Loan B
Line of Credit Facility [Line Items]
Repayment of long-term debt					$ 396,700,000													50,000,000.0	150,000,000.0	396,700,000
Debt Instrument, Issuance Price, Percent Of Principal Amount						99.00%
Debt Instrument, Issuance Discount, Percent						1.00%
Debt Covenant, Mandatory Cash Payment In Excess Of Amount Minimum																		$ 20,000,000.0
Asset sale or disposition period																		1 year
Mandatory prepayment terms																		$ 0
Term Loan B | Interest Expense.
Line of Credit Facility [Line Items]
Debt Issuance Costs Write-off																		$ 1,100,000	4,300,000	12,500,000
Bridge
Line of Credit Facility [Line Items]
Debt Issuance Costs Write-off																				10,329,000
Bridge | Interest Expense.
Line of Credit Facility [Line Items]
Debt Issuance Costs Write-off																				10,300,000
Senior Secured Notes Due 2028 And Term B Loan
Line of Credit Facility [Line Items]
Total net leverage ratio																	4.00%
Cap percentage																		20.00%
Amortization period																		7 years
Senior Secured Notes Due 2028 And Term B Loan | Scenario, Plan
Line of Credit Facility [Line Items]
Total net leverage ratio														3.25%
Senior Secured Notes Due 2028
Line of Credit Facility [Line Items]
Debt instrument, face amount								$ 800,000,000.0
Fixed interest rate								5.50%
Repayment of long-term debt				$ 373,300,000								$ 20,800,000			$ 900,000	$ 394,100,000				394,100,000
Gain on extinguishment of debt																			100,000	2,100,000
Long-term debt, gross																		$ 404,950,000	404,950,000
Percentage of notes issued on par value								100.00%
Redemption price, percentage of principal amount redeemed				100.00%				100.00%				90.00%			92.00%
Debt covenant, percentage of principal amount of notes outstanding								25.00%
Debt Issuance Costs Write-off																			15,000	6,771,000
Senior Secured Notes Due 2028 | Interest Expense.
Line of Credit Facility [Line Items]
Debt Issuance Costs Write-off																				6,800,000
Senior Secured Notes Due 2028 | Accrued Liabilities
Line of Credit Facility [Line Items]
Debt Instrument, Accrued Interest																		$ 7,400,000	7,400,000
Senior Secured Notes Due 2028 | 2024
Line of Credit Facility [Line Items]
Redemption price, percentage of principal amount redeemed								102.75%
Senior Secured Notes Due 2028 | 2025
Line of Credit Facility [Line Items]
Redemption price, percentage of principal amount redeemed								101.375%
Senior Secured Notes Due 2028 | 2026
Line of Credit Facility [Line Items]
Redemption price, percentage of principal amount redeemed								100.00%
Senior Secured Notes Due 2028 | Prior to March 1,2024
Line of Credit Facility [Line Items]
Redemption price percentage								105.50%
Senior Secured Notes Due 2028 | Maximum | Prior to March 1,2024
Line of Credit Facility [Line Items]
Redemption price, percentage of principal amount redeemed								40.00%
Term B Loan
Line of Credit Facility [Line Items]
Debt instrument, face amount						$ 850,000,000.0
Fixed interest rate																		8.84%
Repayment of long-term debt	$ 50,000,000.0	$ 50,000,000.0	$ 100,000,000.0		$ 396,700,000
Long-term debt, gross																		$ 253,333,000	303,333,000
Reduction in margin interest rate	0.50%
Principal payment													$ 2,125,000
Debt Issuance Costs Write-off																		$ 1,113,000	$ 4,282,000	$ 12,471,000
Term B Loan | Alternate Base Rate | Minimum
Line of Credit Facility [Line Items]
Basic spread rate	2.50%					3.00%
Term B Loan | Alternate Base Rate | Maximum
Line of Credit Facility [Line Items]
Basic spread rate	3.00%					3.50%
Term B Loan | Eurocurrency Rate | Minimum
Line of Credit Facility [Line Items]
Basic spread rate	3.50%					4.00%
Term B Loan | Eurocurrency Rate | Maximum
Line of Credit Facility [Line Items]
Basic spread rate	4.00%					4.50%
Term B Loan | SOFR
Line of Credit Facility [Line Items]
Basic spread rate	0.75%					0.75%
Prior Term Loan B
Line of Credit Facility [Line Items]
Debt instrument, face amount											300,000,000.0
Principal payment											$ 750,000
Prior Term Loan B | Base Rate
Line of Credit Facility [Line Items]
Basic spread rate																		2.00%
Debt instrument, description of variable rate basis																		base rate plus 2%
Prior Term Loan B | Eurocurrency Rate
Line of Credit Facility [Line Items]
Basic spread rate									3.00%									3.00%
Debt instrument, description of variable rate basis																		LIBOR-equivalent rate plus 3%
Prior Term Loan B | Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, Fixed Interest Rate										0.946%
Derivative, Swaption Interest Rate									3.946%
Prior Term Loan B | Interest Rate Swap | London Interbank Offered Rate L I B O R Extension [Member]
Line of Credit Facility [Line Items]
Debt instrument, description of variable rate basis										one-month LIBOR
Prior Term Loan B | Interest Rate Swap | London Interbank Offered Rate L I B O R Extension [Member] | Minimum
Line of Credit Facility [Line Items]
Derivative, Floor Interest Rate										0.00%
Prior Term Loan B | Prior Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, expiration date											Apr. 13, 2023